Enhancement: Make use of constructor property promotion

[localheinz]

This pull request

• makes use of constructor property promotion

[codecov]

Codecov Report

Merging #109 (1533339) into main (be98b51) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #109      +/-   ##
============================================
- Coverage     99.11%   99.05%   -0.06%     
  Complexity       59       59              
============================================
  Files            14       14              
  Lines           225      211      -14     
============================================
- Hits            223      209      -14     
  Misses            2        2              

Impacted Files	Coverage Δ
src/Reporter/DefaultReporter.php	100.00% <ø> (ø)
src/SlowTest.php	100.00% <ø> (ø)
src/Subscriber/TestPassedSubscriber.php	93.10% <ø> (-0.65%)	⬇️
src/MaximumCount.php	100.00% <100.00%> (ø)
src/MaximumDuration.php	100.00% <100.00%> (ø)
src/Subscriber/TestPreparedSubscriber.php	100.00% <100.00%> (ø)
src/Subscriber/TestSuiteFinishedSubscriber.php	100.00% <100.00%> (ø)

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