Bump PHP minimum to 8.3 #226

Job	Run time
Linter / json-linter	28s
PHP-Linter (8.3) / linter	10s
PHP-Linter (8.4) / linter	11s
PHP-Linter (8.5) / linter	11s
Linter / yaml-linter	7s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.4, windows-latest	45s
Unit tests, PHP 8.5, ubuntu-latest	22s
Unit tests, PHP 8.3, ubuntu-latest	20s
Unit tests, PHP 8.5, windows-latest	42s
Unit tests, PHP 8.3, windows-latest	42s
Unit tests, PHP 8.4, ubuntu-latest	15s
Quality control	17s
Security checks	19s
Code coverage	10s
Cleanup artifacts	5s
	5m 4s

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