[CI] update caching of gradle packages

[hrzn]

Issue:

Run actions/cache@v2
Warning: The `save-state` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Received 463967 of 4658271 (10.0%), 0.4 MBs/sec
Received 4658271 of 4658271 (100.0%), 4.0 MBs/sec
Cache Size: ~4 MB (4658271 B)
/usr/bin/tar --use-compress-program zstd -d -xf /home/runner/work/_temp/271f80ef-77c9-4353-95c2-7f181f6d3ec9/cache.tzst -P -C /home/runner/work/darts/darts
Cache restored successfully
Warning: The `save-state` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/
Cache restored from key: tests-Linux-gradle-8bb09d9909651fbe7a3937d4f909a83942096e593a50c5bd6f2b23867e8561d1