Update Gradle to 8.6, switch to new Gradle GH actions

[petertrr]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5860e6d) 85.30% compared to head (1833056) 85.30%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #100   +/-   ##
=========================================
  Coverage     85.30%   85.30%           
  Complexity      109      109           
=========================================
  Files            14       14           
  Lines           524      524           
  Branches         89       89           
=========================================
  Hits            447      447           
  Misses           53       53           
  Partials         24       24           

Flag	Coverage Δ
unittests	85.30% <ø> (ø)

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