Docs: Update PHP_CodeSniffer repository link

[rodrigoprimo]

PHP_CodeSniffer has moved to a new GitHub organization. The squizlabs/PHP_CodeSniffer repository is now archived and the project is actively maintained at https://github.com/PHPCSStandards/PHP_CodeSniffer.

See: squizlabs/PHP_CodeSniffer#3932

[brd6]

indeed, thanks @rodrigoprimo!

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.15%. Comparing base (7377710) to head (2305942).
⚠️ Report is 57 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #68      +/-   ##
============================================
+ Coverage     51.31%   56.15%   +4.83%     
- Complexity     1008     1195     +187     
============================================
  Files           216      237      +21     
  Lines          2732     3257     +525     
============================================
+ Hits           1402     1829     +427     
- Misses         1330     1428      +98     

see 20 files with indirect coverage changes

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