Fix: Drop support for PHP 7.2

[localheinz]

This pull request

• drops support for PHP 7.2

[codecov]

Codecov Report

Merging #481 (e7d15d8) into main (8d30c4a) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #481      +/-   ##
============================================
- Coverage     95.97%   95.89%   -0.09%     
  Complexity       52       52              
============================================
  Files             6        6              
  Lines           149      146       -3     
============================================
- Hits            143      140       -3     
  Misses            6        6              

Impacted Files	Coverage Δ
src/Constructs.php	93.87% <0.00%> (-0.07%)	⬇️
src/Exception/ParseError.php	100.00% <0.00%> (ø)

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