[Bug]: Incorrect OneSignalConfig.androidlib/build.gradle Fails to make Android build on Unity 6

[IvanMurzak]

What happened?

Android build fails in Unity 6

Steps to reproduce?

1. Create a project with Unity 6
2. Install OneSignal Unity SDK for Android version 5.1.9
3. Run all steps via `Window/OneSignal SDK Setup`
4. Press `Build` for Android platform

What did you expect to happen?

To have android build generated

OneSignal iOS SDK version

5.1.9

iOS version

17

Specific iOS version

- there is no iOS, just Android

Relevant log output

Incorrect package="com.onesignal.onesignalsdk" found in source AndroidManifest.xml: C:\Projects\Mirrorscape\MirrorscapeApp-Unity6\Library\Bee\Android\Prj\IL2CPP\Gradle\unityLibrary\OneSignalConfig.androidlib\AndroidManifest.xml.
Setting the namespace via the package attribute in the source AndroidManifest.xml is no longer supported.
Recommendation: remove package="com.onesignal.onesignalsdk" from the source AndroidManifest.xml: C:\Projects\Mirrorscape\MirrorscapeApp-Unity6\Library\Bee\Android\Prj\IL2CPP\Gradle\unityLibrary\OneSignalConfig.androidlib\AndroidManifest.xml.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':unityLibrary:OneSignalConfig.androidlib:processReleaseManifest'.
> A failure occurred while executing com.android.build.gradle.tasks.ProcessLibraryManifest$ProcessLibWorkAction
   > Incorrect package="com.onesignal.onesignalsdk" found in source AndroidManifest.xml: C:\Projects\Mirrorscape\MirrorscapeApp-Unity6\Library\Bee\Android\Prj\IL2CPP\Gradle\unityLibrary\OneSignalConfig.androidlib\AndroidManifest.xml.
     Setting the namespace via the package attribute in the source AndroidManifest.xml is no longer supported.
     Recommendation: remove package="com.onesignal.onesignalsdk" from the source AndroidManifest.xml: C:\Projects\Mirrorscape\MirrorscapeApp-Unity6\Library\Bee\Android\Prj\IL2CPP\Gradle\unityLibrary\OneSignalConfig.androidlib\AndroidManifest.xml.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 5s

UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

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