Fix: Use object instead of stdClass

[localheinz]

This pull request

• uses object instead of stdClass

[codecov]

Codecov Report

Merging #664 (47660e3) into main (bcf59d6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #664   +/-   ##
=========================================
  Coverage     99.04%   99.04%           
  Complexity      146      146           
=========================================
  Files            32       32           
  Lines           521      521           
=========================================
  Hits            516      516           
  Misses            5        5           

Impacted Files	Coverage Δ
src/Json.php	100.00% <ø> (ø)
src/Vendor/Composer/ConfigHashNormalizer.php	100.00% <ø> (ø)
src/SchemaNormalizer.php	95.72% <100.00%> (ø)

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