chore(deps): update plugin com.diffplug.spotless to v8.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless	8.8.0 → 8.9.0

---

Configuration

📅 Schedule: (UTC)

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

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, 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 91.94%. Comparing base (33b2546) to head (3a880a6).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #220      +/-   ##
============================================
+ Coverage     91.78%   91.94%   +0.15%     
- Complexity      435      437       +2     
============================================
  Files            32       32              
  Lines          1303     1303              
  Branches        242      242              
============================================
+ Hits           1196     1198       +2     
  Misses           33       33              
+ Partials         74       72       -2     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.