Administration: Remove invalid attribute `maxlength` on `number` input. #28906

Job	Run time
PHP coding standards	28s
JavaScript coding standards	57s
Slack Notifications / Prepare notifications	5s
Slack Notifications / Success notifications	3s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	1m 33s

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