Upgrade to Gradle v8.4, junit 5. Fix configuration cache issues

[wwadge]

Bump to more recent versions of gradle and junit + fix some (all?) gradle config cache issues.

Fix https://github.com/GoogleContainerTools/jib/issues/4062, https://github.com/GoogleContainerTools/jib/issues/3132 https://github.com/GoogleContainerTools/jib/issues/4052, https://github.com/GoogleContainerTools/jib/issues/3877 and probably a few more

PR: https://github.com/GoogleContainerTools/jib/pull/4069

[alicejli]

Reassigning to @mpeddada1 as she's done the work to review https://github.com/GoogleContainerTools/jib/pull/4139