Add PHP 8.5 support

[lkrms]

• Update dependencies
• Update tools
• Update apigen
• Run PHPStan on all PHP versions
• Add non-mandatory PHP 8.5 jobs to CI workflow
• Fix code to satisfy PHPStan checks on PHP 8.5
• Fix code to satisfy PHPunit tests on PHP 8.5

[codecov]

Codecov Report

❌ Patch coverage is 61.53846% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.96%. Comparing base (0ef4423) to head (697f900).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/Toolkit/Core/Pipeline.php	0.00%	5 Missing ⚠️
src/Toolkit/Cli/CliCommand.php	60.00%	2 Missing ⚠️
src/Toolkit/PHPDoc/PHPDocUtil.php	0.00%	2 Missing ⚠️
...t/Sli/Command/Generate/AbstractGenerateCommand.php	0.00%	1 Missing ⚠️

Additional details and impacted files

Components	Coverage Δ
Cache	100.00% <ø> (ø)
Cli	76.66% <66.66%> (-0.02%)	⬇️
Collections	84.79% <ø> (ø)
Console	85.53% <100.00%> (ø)
Container	75.84% <ø> (ø)
Contracts	∅ <ø> (∅)
Core	81.63% <37.50%> (-0.17%)	⬇️
Curler	64.93% <ø> (ø)
Db	0.00% <ø> (ø)
Http	81.28% <100.00%> (ø)
Iterators	82.22% <ø> (ø)
PHPDoc	91.04% <0.00%> (-0.07%)	⬇️
PHPStan	99.08% <ø> (-0.23%)	⬇️
Polyfills	100.00% <ø> (ø)
Sli	41.12% <0.00%> (ø)
Sync	66.53% <100.00%> (-0.01%)	⬇️
Testing	77.16% <ø> (ø)
Utils	93.44% <100.00%> (+<0.01%)	⬆️

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