Social: Fix Bluesky custom domain handle not being accepted #77666

Job	Run time
Determine tests matrix	8s
Static analysis	8m 14s
Check plugin monorepo dep versions	40s
Storybook tests	3m 5s
PHP tests: PHP 7.2 WP latest	4m 16s
PHP tests: PHP 7.3 WP latest	3m 42s
PHP tests: PHP 7.4 WP latest	4m 51s
PHP tests: PHP 8.0 WP latest	4m 2s
PHP tests: PHP 8.1 WP latest	4m 28s
PHP tests: PHP 8.2 WP latest	3m 34s
PHP tests: PHP 8.3 WP latest	3m 51s
PHP tests: PHP 7.0 WP previous	4m 47s
PHP tests: PHP 8.2 WP previous	4m 16s
PHP tests: PHP 8.2 WP trunk	5m 49s
PHP tests: PHP 7.4 WP latest with WooCommerce	3m 7s
PHP tests: PHP 8.1 WP latest with wpcomsh	4m 20s
JS tests	2m 59s
	1h 6m 9s

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