Fix: Drop support for PHP 7.2

[localheinz]

This pull request

• drops support for PHP 7.2

[codecov]

Codecov Report

Merging #416 (5ed3b76) into main (eaf4599) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 5ed3b76 differs from pull request most recent head ca4a17f. Consider uploading reports for the commit ca4a17f to get more accurate results

@@             Coverage Diff              @@
##               main     #416      +/-   ##
============================================
- Coverage     98.88%   98.87%   -0.01%     
  Complexity       58       58              
============================================
  Files            14       14              
  Lines           179      178       -1     
============================================
- Hits            177      176       -1     
  Misses            2        2              

Impacted Files	Coverage Δ
src/File.php	100.00% <0.00%> (ø)
src/Range.php	100.00% <0.00%> (ø)
src/Header.php	100.00% <0.00%> (ø)
src/Type/MIT.php	100.00% <0.00%> (ø)

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