Gradle 7 support

[c47harsis]

While using kscript tool, I've got the error:

[kscript] Packaging script 'test' into standalone executable...
[kscript] [ERROR] packaging of 'test' failed:
            Exit Code   : 1Comand      : bash -c cd '/Users/lnlysnke/.kscript/kscript_tmp_project__test.bf8ee045ad884690.jar_1638304823275' && gradle simpleCapsule
            Stdout      :
Welcome to Gradle 7.3!

Here are the highlights of this release:
 - Easily declare new test suites in Java projects
 - Support for Java 17
 - Support for Scala 3

For more details see https://docs.gradle.org/7.3/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)
> Task :compileKotlin NO-SOURCE
> Task :compileJava NO-SOURCE
> Task :processResources NO-SOURCE
> Task :classes UP-TO-DATE
> Task :inspectClassesForKotlinIC
> Task :jar
> Task :simpleCapsule FAILED

Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

See https://docs.gradle.org/7.3/userguide/command_line_interface.html#sec:command_line_warnings
3 actionable tasks: 3 executed

            Stderr      :

FAILURE: Build failed with an exception.

* What went wrong:
Some problems were found with the configuration of task ':simpleCapsule' (type 'FatCapsule').
  - In plugin 'it.gianluz.capsule' type 'us.kirchmeier.capsule.task.FatCapsule' property 'applicationSource' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.3/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'it.gianluz.capsule' type 'us.kirchmeier.capsule.task.FatCapsule' property 'capletConfiguration' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.3/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'it.gianluz.capsule' type 'us.kirchmeier.capsule.task.FatCapsule' property 'capsuleConfiguration' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.3/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'it.gianluz.capsule' type 'us.kirchmeier.capsule.task.FatCapsule' property 'capsuleFilter' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.3/userguide/validation_problems.html#missing_annotation for more details about this problem.
  - In plugin 'it.gianluz.capsule' type 'us.kirchmeier.capsule.task.FatCapsule' property 'capsuleManifest' is missing an input or output annotation.

    Reason: A property without annotation isn't considered during up-to-date checking.

    Possible solutions:
      1. Add an input or output annotation.
      2. Mark it as @Internal.

    Please refer to https://docs.gradle.org/7.3/userguide/validation_problems.html#missing_annotation for more details about this problem.

* 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 22s

After some googling I've found this question on stackoverflow.com and it seems like a solution for that is not so difficult.

As a workaround just for touching kscript I downgraded my gradle version to 6.x, but it is better to be fixed I think.

Maybe later I'll make a PR, but if someone do that faster it would be great! 😄