build: Update dependency gradle to v8.6

[renovate]

This PR contains the following updates:

Package	Update	Change
gradle (source)	minor	8.5 -> 8.6

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Release Notes

gradle/gradle (gradle)

v8.6

Compare Source

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Configuration

📅 Schedule: Branch creation - "before 9am on Saturday every 1 week" in timezone Europe/Berlin, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7dd8b51) 97.43% compared to head (d4560fd) 97.26%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #175      +/-   ##
============================================
- Coverage     97.43%   97.26%   -0.18%     
+ Complexity      140      139       -1     
============================================
  Files            27       27              
  Lines           584      584              
  Branches         23       23              
============================================
- Hits            569      568       -1     
  Misses            5        5              
- Partials         10       11       +1     

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