Fix: Sort config by key

[localheinz]

This pull request

• asserts that the config has is sorted by key
• sorts the config hash by key

Fixes ergebnis/composer-normalize#1058.

[codecov]

Codecov Report

Merging #861 (8cb50df) into main (5df8b9d) will decrease coverage by 0.24%.
The diff coverage is 89.47%.

@@             Coverage Diff              @@
##               main     #861      +/-   ##
============================================
- Coverage     97.72%   97.49%   -0.24%     
- Complexity      153      158       +5     
============================================
  Files            29       30       +1     
  Lines           660      679      +19     
============================================
+ Hits            645      662      +17     
- Misses           15       17       +2     

Impacted Files	Coverage Δ
src/Vendor/Composer/ConfigHashNormalizer.php	88.88% <88.88%> (ø)
src/Vendor/Composer/ComposerJsonNormalizer.php	86.66% <100.00%> (+0.45%)	⬆️

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