Enhancement: Update phpunit/phpunit

[localheinz]

This PR

• updates phpunit/phpunit

💁‍♂️ For reference, see sebastianbergmann/phpunit@7.1.5...7.4.3.

[codecov]

Codecov Report

Merging #97 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             master    #97   +/-   ##
=======================================
  Coverage       100%   100%           
+ Complexity       74     71    -3     
=======================================
  Files             7      7           
  Lines           275    272    -3     
=======================================
- Hits            275    272    -3

Impacted Files	Coverage Δ	Complexity Δ
src/Normalizer/VersionConstraintNormalizer.php	100% <0%> (ø)	9% <0%> (-1%)	⬇️
src/Command/NormalizeCommand.php	100% <0%> (ø)	32% <0%> (-1%)	⬇️
src/Normalizer/PackageHashNormalizer.php	100% <0%> (ø)	9% <0%> (-1%)	⬇️

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