Update actions/setup-java action to v6 (12.5)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-java	action	major	v5.7.0 → v6.0.0

---

Release Notes

actions/setup-java (actions/setup-java)

v6.0.0

Compare Source

---

Configuration

📅 Schedule: (in timezone Europe/Berlin)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.03%. Comparing base (5b0c025) to head (ab34666).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##               12.5    #6923   +/-   ##
=========================================
  Coverage     96.03%   96.03%           
  Complexity     7576     7576           
=========================================
  Files           798      798           
  Lines         23233    23233           
=========================================
  Hits          22312    22312           
  Misses          921      921           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.