Fix: Declare objects as immutable

[localheinz]

This pull request

• declares objects as immutable

[codecov]

Codecov Report

Merging #153 (36086b5) into main (e62b5db) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #153   +/-   ##
=========================================
  Coverage     98.00%   98.00%           
  Complexity       38       38           
=========================================
  Files             9        9           
  Lines           100      100           
=========================================
  Hits             98       98           
  Misses            2        2           

Impacted Files	Coverage Δ
src/Json.php	95.23% <ø> (ø)
src/Result.php	100.00% <ø> (ø)

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