General: Update to phpstan level 10

[pprkut]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 38.02%. Comparing base (b7d8673) to head (3a794ab).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Lunr/Halo/LunrBaseTestCase.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #40      +/-   ##
============================================
- Coverage     38.12%   38.02%   -0.10%     
  Complexity      131      131              
============================================
  Files             6        6              
  Lines           383      384       +1     
============================================
  Hits            146      146              
- Misses          237      238       +1     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
8.7% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud