fix(deps): update spotless to v8.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless	8.3.0 → 8.4.0
com.diffplug.spotless:spotless-plugin-gradle	8.3.0 → 8.4.0

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Configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.92%. Comparing base (89c36e2) to head (3465d5e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1661   +/-   ##
=======================================
  Coverage   61.92%   61.92%           
=======================================
  Files         159      159           
  Lines        3409     3409           
  Branches      345      345           
=======================================
  Hits         2111     2111           
  Misses       1204     1204           
  Partials       94       94           

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[fractalwrench]

LGTM