Filesystem API: Check `PHP_OS_FAMILY` instead of `php_uname()` in Pcl… #40492

Job	Run time
PHP coding standards / Run coding standards checks	27s
JavaScript coding standards / Run coding standards checks	54s
Slack Notifications / Prepare notifications	2s
Slack Notifications / Success notifications	4s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	1m 27s

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