Formatting: Prevent stack overflow in `safecss_filter_attr`. #27843

Job	Run time
QUnit Tests / Run QUnit tests	15m 2s
Slack Notifications / Prepare notifications	15m 2s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Success notifications	0s
Slack Notifications / Failure notifications	0s
Failed workflow tasks	-1s
QUnit Tests / Run QUnit tests	1m 33s
Slack Notifications / Prepare notifications	5s
Slack Notifications / Success notifications	5s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	0s
Failed workflow tasks	-1s
	31m 45s

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