Update created build.gradle to use Junit 5.6.3+ so that existing team JUnit4 tests still function

[fovea1959]

Is your feature request related to a problem? Please describe.
We have existing libraries from previous years that have JUnit4 tests. 2023 beta-6 generates the following snippet of build.gradle:

    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
    testImplementation 'org.junit.jupiter:junit-jupiter-params:5.4.2'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'

We would prefer not to rewrite our JUnit4 tests, so we want to use org.junit.vintage:junit-vintage-engine to run our old tests:

    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
    testImplementation 'org.junit.jupiter:junit-jupiter-params:5.4.2'
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'

    testImplementation("junit:junit:4.13.2")
    testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.4.2") {
        because 'allows JUnit 3 and JUnit 4 tests to run'
    }

However, builds fail with:

org.gradle.api.internal.tasks.testing.TestSuiteExecutionException: Could not complete execution for Gradle Test Executor 1.
        ...traceback...
Caused by: org.junit.platform.commons.JUnitException: TestEngine with ID 'junit-vintage' failed to discover tests
        ...traceback...
Caused by: org.junit.platform.commons.JUnitException: Failed to parse version of junit:junit: 4.13.2

Research reveals that versions of JUnit 5 prior to 5.6.3 have this issue. Ref: https://stackoverflow.com/a/67566548/17887564 and
junit-team/junit5#2198.

Describe the solution you'd like
Have "Create Project" generate a build.gradle with references to JUnit 5.6.3(+).

Describe alternatives you've considered
Our alternatives are to simply fix the versions in build.gradle whenever we have a project with tests, or rewrite our tests for JUnit5 (straightforward, but time consuming)

Additional context
It appears that the build for wpilibj itself uses JUnit 5.8.2 (ref: https://github.com/wpilibsuite/allwpilib/blob/main/shared/java/javacommon.gradle#L115, so apparently it's trustworthy?

[rzblue]

You can remove the dependencies for junit 5 and replace with junit 4, or whatever other test suite you'd like to use- they are there as a convenience for teams.

You can also update to whatever junit version you want.

[Starlight220]

I don't see a reason not to upgrade for the next release