feat: fixes lint errors from latest phpcs config

[m0hanraj]

• Updates PHPCS, PHPStan and PHPMD packages to latest version
• Tests compatibility with WP 6.8

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.41%. Comparing base (bdc1edb) to head (63198d6).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #206      +/-   ##
============================================
+ Coverage     81.67%   82.41%   +0.73%     
  Complexity       24       24              
============================================
  Files            17       17              
  Lines           191      199       +8     
  Branches          9        9              
============================================
+ Hits            156      164       +8     
  Misses           27       27              
  Partials          8        8              

Flag	Coverage Δ
integrationtests	96.62% <ø> (+0.33%)	⬆️
jstests	70.90% <ø> (ø)
unittests	31.46% <ø> (-1.88%)	⬇️

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