Use composer.json for cache key #142

Job	Run time
Quality control	42s
Security checks	37s
Linter / json-linter	24s
Linter / yaml-linter	4s
PHP-Linter (8.5) / linter	14s
PHP-Linter (8.4) / linter	10s
PHP-Linter (8.3) / linter	12s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP 8.5, ubuntu-latest	34s
Unit tests, PHP 8.3, ubuntu-latest	24s
Unit tests, PHP 8.4, ubuntu-latest	29s
Unit tests, PHP 8.5, windows-latest	57s
Unit tests, PHP 8.3, windows-latest	1m 11s
Unit tests, PHP 8.4, windows-latest	1m 31s
Code coverage	11s
Cleanup artifacts	5s
	7m 45s

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