Bump actions/cache from 5 to 6 in the all-actions group #567

Job	Run time
PHP-Linter (8.3) / linter	9s
PHP-Linter (8.4) / linter	12s
PHP-Linter (8.5) / linter	10s
Linter / yaml-linter	6s
Linter / json-linter	26s
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	0s
Security checks	0s
Quality control	-1s
Cleanup artifacts	-1s
	1m 1s

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