Bump minimum PHP version and fix composer cache #121

Job	Run time
PHP-Linter (8.5) / linter	14s
PHP-Linter (8.4) / linter	13s
Linter / json-linter	30s
Linter / yaml-linter	7s
PHP-Linter (8.3) / linter	12s
Linter / style-linter	0s
Linter / ecmascript-linter	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Code coverage	-1s
Quality control	-1s
Security checks	-1s
Cleanup artifacts	-1s
PHP-Linter (8.5) / linter	10s
PHP-Linter (8.4) / linter	13s
Linter / ecmascript-linter	-121s
Linter / json-linter	30s
Linter / style-linter	-121s
Linter / yaml-linter	7s
PHP-Linter (8.3) / linter	12s
Unit tests, PHP 8.3, windows-latest	1m 32s
Unit tests, PHP 8.3, ubuntu-latest	16s
Unit tests, PHP 8.5, windows-latest	1m 6s
Unit tests, PHP 8.4, ubuntu-latest	23s
Unit tests, PHP 8.5, ubuntu-latest	19s
Unit tests, PHP 8.4, windows-latest	1m 30s
Quality control	24s
Security checks	20s
Code coverage	6s
Cleanup artifacts	5s
	4m 23s

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