Update Micronaut gradle plugins to 4.6.0

[lissam1]

No description provided.

[sdelamo]

tests were failing due to micronaut-projects/micronaut-gradle-plugin#1165

I added the junit-platform dependency

[melix]

We should investigate the build failure on Windows. Looks like the workflow might be not installing GraalVM correctly or something.

[radovanradic]

Getting this error in micronaut-data graalvm test when upgrading to 4.5.5

Error: An object of type 'org.junit.platform.launcher.EngineDiscoveryResult$Status' was found in the image heap. This type, however, is marked for initialization at image run time for the following reason: classes are initialized at run time by default.
This is not allowed for correctness reasons: All objects that are stored in the image heap must be initialized at build time.

You now have two options to resolve this:

1) If it is intended that objects of type 'org.junit.platform.launcher.EngineDiscoveryResult$Status' are persisted in the image heap, add 

    '--initialize-at-build-time=org.junit.platform.launcher.EngineDiscoveryResult$Status'
...

Is this related?

[sdelamo]

@radovanradic I don't think the error is related:

ANTLR Tool version 4.7.2 used for code generation does not match the current runtime version 4.8ANTLR Runtime version 4.7.2 used for parser compilation does not match the current runtime version 4.8ANTLR Tool version 4.7.2 used for code generation does not match the current runtime version 4.8ANTLR Runtime version 4.7.2 used for parser compilation does not match the current runtime version 4.8

[Incubating] Problems report is available at: file:///D:/a/micronaut-starter/micronaut-starter/build/reports/problems/problems-report.html
FAILURE: Build failed with an exception.

* Where:
Build file 'D:\a\micronaut-starter\micronaut-starter\build.gradle' line: 5

I think we are not going to update Micronaut Launch to 4.5.5 until this is solved.