Raise minimum PHP-version to 8.5 #1389

Job	Run time
PHP-Linter (8.5) / linter	9s
Linter / yaml-linter	4s
Linter / json-linter	24s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.5, ubuntu-latest	23s
Unit tests, PHP 8.5, windows-latest	55s
Code coverage	7s
Security checks	15s
Quality control	35s
Cleanup artifacts	3s
	2m 55s

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