Pin GitHub Action #2615

Job	Run time
test / Get base test matrix	4s
test / Prepare matrix for functional tests	9s
test / Prepare matrix for unit tests	11s
test / Functional (8.5, latest, mysql-8.0, true) / PHP 8.5 \| WP latest \| MySQL (with coverage)	5m 18s
test / Unit	0s
	5m 42s

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