doesn't work on paper 1.20.6 without remapping

[IssueDescription]

Describe the bug If you have remapping disabled on paper, packetevents doesnt work, because packet events is still using spigot obfuscated nms calls, there should be support for mojang mapped, which is what paper is using now since 1.20.5

[14:32:21 INFO]: [packetevents] Enabling packetevents v2.3.1
[14:32:21 WARN]: java.lang.NoSuchMethodException: net.minecraft.world.item.ItemStack.<init>(net.minecraft.world.item.Item,int)
[14:32:21 WARN]:        at java.base/java.lang.Class.getConstructor0(Class.java:3761)
[14:32:21 WARN]:        at java.base/java.lang.Class.getConstructor(Class.java:2442)
[14:32:21 WARN]:        at packetevents-spigot-latest.jar//io.github.retrooper.packetevents.util.SpigotReflectionUtil.initConstructors(SpigotReflectionUtil.java:134)
[14:32:21 WARN]:        at packetevents-spigot-latest.jar//io.github.retrooper.packetevents.util.SpigotReflectionUtil.init(SpigotReflectionUtil.java:392)
[14:32:21 WARN]:        at packetevents-spigot-latest.jar//io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.load(SpigotPacketEventsBuilder.java:103)
[14:32:21 WARN]:        at packetevents-spigot-latest.jar//io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.init(SpigotPacketEventsBuilder.java:137)
[14:32:21 WARN]:        at packetevents-spigot-latest.jar//io.github.retrooper.packetevents.PacketEventsPlugin.onEnable(PacketEventsPlugin.java:47)
[14:32:21 WARN]:        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:287)
[14:32:21 WARN]:        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202)
[14:32:21 WARN]:        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109)
[14:32:21 WARN]:        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519)
[14:32:21 WARN]:        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:604)
[14:32:21 WARN]:        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:553)
[14:32:21 WARN]:        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:678)
[14:32:21 WARN]:        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:437)
[14:32:21 WARN]:        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:323)
[14:32:21 WARN]:        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1139)
[14:32:21 WARN]:        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323)
[14:32:21 WARN]:        at java.base/java.lang.Thread.run(Thread.java:1583)
[14:32:21 ERROR]: Error occurred while enabling packetevents v2.3.1 (Is it up to date?)
java.lang.NullPointerException: Cannot invoke "java.lang.reflect.Field.get(Object)" because the return value of "com.github.retrooper.packetevents.util.reflection.Reflection.getField(java.lang.Class, java.lang.Class, int)" is null
        at packetevents-spigot-latest.jar/io.github.retrooper.packetevents.util.SpigotReflectionUtil.getMinecraftServerConnectionInstance(SpigotReflectionUtil.java:438) ~[packetevents-spigot-latest.jar:?]
        at packetevents-spigot-latest.jar/io.github.retrooper.packetevents.injector.SpigotChannelInjector.isServerBound(SpigotChannelInjector.java:63) ~[packetevents-spigot-latest.jar:?]
        at packetevents-spigot-latest.jar/io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.load(SpigotPacketEventsBuilder.java:115) ~[packetevents-spigot-latest.jar:?]
        at packetevents-spigot-latest.jar/io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.init(SpigotPacketEventsBuilder.java:137) ~[packetevents-spigot-latest.jar:?]
        at packetevents-spigot-latest.jar/io.github.retrooper.packetevents.PacketEventsPlugin.onEnable(PacketEventsPlugin.java:47) ~[packetevents-spigot-latest.jar:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:287) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:519) ~[paper-api-1.20.6-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:604) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:553) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:678) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:437) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:323) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1139) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) ~[paper-1.20.6.jar:1.20.6-DEV-9bf4855]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
[14:32:21 INFO]: [packetevents] Disabling packetevents v2.3.1

Software brand This server is running Paper version 1.20.6-DEV-master@9bf4855 (2024-05-21T12:41:52Z) (Implementing API version 1.20.6-R0.1-SNAPSHOT) Unknown version Previous version: 1.20.6-86-9bf4855 (MC: 1.20.6)

Plugins Just using packet events by itself

How To Reproduce Load it on latest paper (with remapping disabled) Issue is that paper since 1.20.5 doesn't use obfuscated nms anymore, its mojang mapping

Expected behavior Should load