fix: PHPStan types

[SMillerDev]

[sonarqubecloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
7 Code Smells

56.7% Coverage
0.0% Duplication

[codecov[bot]]

Codecov Report

Patch coverage: 61.76% and project coverage change: -0.97 :warning:

Comparison is base (7982a87) 80.57% compared to head (ac752fc) 79.60%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #465      +/-   ##
============================================
- Coverage     80.57%   79.60%   -0.97%     
- Complexity      323      332       +9     
============================================
  Files            23       23              
  Lines           798      814      +16     
============================================
+ Hits            643      648       +5     
- Misses          155      166      +11     

Impacted Files	Coverage Δ
src/PHPDraft/Model/HTTPResponse.php	87.50% <ø> (ø)
src/PHPDraft/Model/Resource.php	100.00% <ø> (ø)
src/PHPDraft/Out/TemplateRenderer.php	52.00% <14.28%> (-2.17%)	:arrow_down:
src/PHPDraft/Parse/Drafter.php	74.07% <42.85%> (-16.84%)	:arrow_down:
src/PHPDraft/In/ApibFileParser.php	92.15% <50.00%> (-3.59%)	:arrow_down:
src/PHPDraft/Model/Transition.php	91.11% <66.66%> (+0.09%)	:arrow_up:
.../PHPDraft/Model/Elements/BasicStructureElement.php	63.46% <100.00%> (ø)
...c/PHPDraft/Model/Elements/EnumStructureElement.php	90.00% <100.00%> (+0.25%)	:arrow_up:
...PHPDraft/Model/Elements/ObjectStructureElement.php	92.50% <100.00%> (ø)
src/PHPDraft/Model/Elements/RequestBodyElement.php	100.00% <100.00%> (ø)
... and 2 more

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