fix/openapi/general

[SMillerDev]

• chore: update build script for newer PHP
• chore: clean duplicate isset usage
• fix: protect OpenAPI generation

[codecov]

Codecov Report

Attention: Patch coverage is 46.15385% with 7 lines in your changes missing coverage. Please review.

Project coverage is 66.60%. Comparing base (f1ed0ba) to head (c1ff8e4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PHPDraft/Out/OpenAPI/OpenApiRenderer.php	0.00%	6 Missing ⚠️
src/PHPDraft/Model/HTTPResponse.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #678      +/-   ##
============================================
- Coverage     66.69%   66.60%   -0.09%     
+ Complexity      441      439       -2     
============================================
  Files            26       26              
  Lines          1126     1129       +3     
============================================
+ Hits            751      752       +1     
- Misses          375      377       +2     

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