Remove restoreKeys to clear cache after update

[schuenadel]

Description:
Suggestion (like commented here) to remove fallback hash key to avoid keeping dependencies "forever". Start with a completely clean cache whenever any dependency changes.

Related issue:
#269

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[dmitry-shibanov]

Hello @schuenadel. Could you please sync with the main branch ?

[schuenadel]

@dmitry-shibanov done ✅

[paramaggarwal]

This is a bad change, this effectively makes caching useless when the linked file like pom.xml has even a tiny change.

[thomasmey]

Yes, setup-java should use a per build system strategy for setting the restore-keys, for maven build system this change is really bad