Fix: Set XDEBUG_MODE to coverage when collecting code coverage

[localheinz]

This pull request

• sets XDEBUG_MODE to coverage when collecting code coverage

[codecov]

Codecov Report

Merging #434 (042fe2a) into main (e89f7cd) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #434      +/-   ##
============================================
- Coverage     98.92%   98.88%   -0.05%     
  Complexity       58       58              
============================================
  Files            14       14              
  Lines           186      179       -7     
============================================
- Hits            184      177       -7     
  Misses            2        2              

Impacted Files	Coverage Δ
src/Type/MIT.php	100.00% <0.00%> (ø)

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