Use composer.json for cache key #212

Job	Run time
Linter / json-linter	28s
PHP-Linter (8.3) / linter	9s
PHP-Linter (8.4) / linter	11s
PHP-Linter (8.5) / linter	13s
Linter / yaml-linter	6s
Linter / ecmascript-linter	0s
Linter / style-linter	0s
Unit tests, PHP 8.4, ubuntu-latest	33s
Unit tests, PHP 8.3, windows-latest	1m 24s
Unit tests, PHP 8.4, windows-latest	1m 14s
Unit tests, PHP 8.5, ubuntu-latest	40s
Unit tests, PHP 8.5, windows-latest	1m 10s
Unit tests, PHP 8.3, ubuntu-latest	30s
Security checks	25s
Code coverage	6s
Quality control	46s
Cleanup artifacts	5s
	8m 0s

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