feat: add gradle-jdk21 action to support java 21

[barrett-rob]

No description provided.

[barrett-rob]

Support ticket link is #134

[quosco]

Is there any ETA when this PR will be merged?

[jan-leanix]

Would be really good to get this PR merged as Java 21 is already the LTS for a while now. We are currently blocked upgrading to 21 due to Snyk missing this support for the action.

[quosco]

Would be really good to get this PR merged as Java 21 is already the LTS for a while now. We are currently blocked upgrading to 21 due to Snyk missing this support for the action.

Same for us, we can't upgrade to Java 21.
For Java LTS releases I would expect a fast release after JDK goes GA, taking into consideration that it is available 1-2 months before GA.

[andreaslhv]

Same for us, this is blocking our upgrade to Java 21

[abhisheksr01]

When will this PR be merged, the PR is open for a year now.

[github-actions]

Your PR has not had any activity for 30 days. In 2 days I'll close it. Make some activity to remove this.

[snyk-io]

🎉 Snyk checks have passed. No issues have been found so far.

✅ code/snyk check is complete. No issues have been found. (View Details)

[dotkas]

Sorry for the wait on this one. See: #168