Use only native PHPUnit test loader

[Slamdunk]

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[codecov]

Codecov Report

Merging #500 into master will increase coverage by 0.44%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #500      +/-   ##
============================================
+ Coverage     90.72%   91.16%   +0.44%     
+ Complexity      631      612      -19     
============================================
  Files            33       32       -1     
  Lines          1692     1652      -40     
============================================
- Hits           1535     1506      -29     
+ Misses          157      146      -11     

Impacted Files	Coverage Δ	Complexity Δ
src/Runners/PHPUnit/SuiteLoader.php	97.43% <100.00%> (-0.02%)	77.00 <0.00> (ø)

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