Update spotless packages to v8.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless:spotless-plugin-gradle	8.5.1 → 8.6.0
com.diffplug.spotless	8.5.1 → 8.6.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.01%. Comparing base (8ea776b) to head (f396b7b).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8441      +/-   ##
============================================
+ Coverage     90.99%   91.01%   +0.02%     
- Complexity     7814     7816       +2     
============================================
  Files           892      892              
  Lines         23718    23718              
  Branches       2364     2364              
============================================
+ Hits          21582    21588       +6     
+ Misses         1416     1409       -7     
- Partials        720      721       +1     

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