Bump actions/cache from 5 to 6 in the all-actions group #149

Job	Run time
PHP-Linter (8.3) / linter	15s
PHP-Linter (8.4) / linter	15s
Linter / yaml-linter	6s
Linter / json-linter	30s
PHP-Linter (8.5) / linter	16s
Linter / style-linter	0s
Linter / ecmascript-linter	-8s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Security checks	0s
Quality control	0s
Code coverage	0s
Cleanup artifacts	0s
	1m 14s

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