Enhancement: Add support for PHP 7.4

[localheinz]

This pull request

• adds support for PHP 7.4

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e0c7a35) 96.44% compared to head (593cd32) 96.47%.

❗ Current head 593cd32 differs from pull request most recent head 68e3b49. Consider uploading reports for the commit 68e3b49 to get more accurate results

Files	Patch %	Lines
...rc/Vendor/Composer/VersionConstraintNormalizer.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1080      +/-   ##
============================================
+ Coverage     96.44%   96.47%   +0.03%     
  Complexity      196      196              
============================================
  Files            32       32              
  Lines           815      823       +8     
============================================
+ Hits            786      794       +8     
  Misses           29       29              

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