Pin some GitHub Actions #686

Job	Run time
Build Phar	42s
Functional - WP latest on PHP 7.4 with MySQL 8.0	6m 59s
Functional - WP trunk on PHP 7.4 with MySQL 5.6	6m 45s
Functional - WP trunk on PHP 7.4 with MySQL 5.7	5m 58s
Functional - WP latest on PHP 7.3 with MySQL 8.0	5m 39s
Functional - WP trunk on PHP 7.4 with MySQL 8.0	6m 52s
Functional - WP latest on PHP 7.2 with MySQL 8.0	6m 45s
Functional - WP trunk on PHP 8.5 with MySQL 8.0	4m 44s
Functional - WP trunk on PHP 8.5 with MySQL 5.7	12m 47s
Functional - WP latest on PHP 8.5 with MySQL 8.0	5m 16s
Functional - WP trunk on PHP 8.5 with MySQL 5.6	5m 0s
Functional - WP 4.9 on PHP 7.2 with MySQL 5.6	5m 29s
Deployment	19s
Build RPM package	0s
Build DEB package	0s
	1h 13m 15s

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