Fix: Bring duration formatting in line with phpunit/php-timer

[localheinz]

This pull request

• brings the duration formatting in line phpunit/php-timer

[codecov]

Codecov Report

Merging #220 (d3ed7b7) into main (9c256db) will increase coverage by 0.78%.
The diff coverage is 100.00%.

❗ Current head d3ed7b7 differs from pull request most recent head 9a2e396. Consider uploading reports for the commit 9a2e396 to get more accurate results

@@             Coverage Diff              @@
##               main     #220      +/-   ##
============================================
+ Coverage     90.18%   90.97%   +0.78%     
- Complexity       59       61       +2     
============================================
  Files            15       15              
  Lines           265      288      +23     
============================================
+ Hits            239      262      +23     
  Misses           26       26              

Impacted Files	Coverage Δ
src/Extension.php	100.00% <100.00%> (ø)
src/Formatter/DefaultDurationFormatter.php	100.00% <100.00%> (ø)

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