Enhancement: Update infection/infection, phpstan/phpstan, and phpstan/phpstan-strict-rules

[localheinz]

This PR

• updates infection/infection, phpstan/phpstan, and phpstan/phpstan-strict-rules
• fixes errors detected by static analysis

💁‍♂️ For reference, see

• infection/infection@0.8.1...0.11.0
• phpstan/phpstan@0.9.2...0.10.5
• phpstan/phpstan-strict-rules@0.9...0.10.1

[codecov]

Codecov Report

Merging #104 into master will decrease coverage by 0.27%.
The diff coverage is 42.85%.

@@             Coverage Diff              @@
##             master     #104      +/-   ##
============================================
- Coverage     72.72%   72.45%   -0.28%     
  Complexity       63       63              
============================================
  Files             7        7              
  Lines           264      265       +1     
============================================
  Hits            192      192              
- Misses           72       73       +1

Impacted Files	Coverage Δ	Complexity Δ
src/Normalizer/VersionConstraintNormalizer.php	96.55% <ø> (ø)	8 <0> (ø)	⬇️
src/Normalizer/ConfigHashNormalizer.php	94.73% <ø> (ø)	6 <0> (ø)	⬇️
src/Command/NormalizeCommand.php	55.34% <0%> (-0.36%)	32 <0> (ø)
src/Normalizer/PackageHashNormalizer.php	100% <100%> (ø)	7 <0> (ø)	⬇️
src/NormalizePlugin.php	100% <100%> (ø)	3 <1> (ø)	⬇️
src/Normalizer/BinNormalizer.php	100% <100%> (ø)	4 <0> (ø)	⬇️

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