Bump @csstools/stylelint-no-at-nest-rule from 1.0.0 to 4.0.0 #13867

Job	Run time
Build image	16s
Build locales	16s
Format	13s
Lint CSS	11s
Smoke test	0s
Build assets	13s
Web Tests	8s
Test (${{ matrix.shard }}/${{ strategy.job-total }})	0s
Integration test (${{ matrix.shard }}/${{ strategy.job-total }})	0s
Visual regression test (${{ matrix.shard }}/${{ strategy.job-total }})	0s
Lint TypeScript	0s
Typecheck	0s
Push image	0s
Deploy (${{ matrix.instance }})	0s
Update Crowdin	0s
Notify of failure	0s
	1m 17s

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