refactor: Replace dirname(__FILE__) with __DIR__

[ChristophWurst]

🧹

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (57492ab) to head (3bfeaee).
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #675      +/-   ##
============================================
+ Coverage     98.76%   98.78%   +0.02%     
  Complexity     1874     1874              
============================================
  Files            71       71              
  Lines          5343     5270      -73     
============================================
- Hits           5277     5206      -71     
+ Misses           66       64       -2     

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[phil-davis]

"something happened" with the CI for PHP 8.0.
I reran it and it passes.

[phil-davis]

Note: tests only, this does not trigger a need to release.

[phil-davis]

Backported to 4.5 branch in PR #693