chore: update Nx to v21 (#1082) #6364

Job	Run time
Linter	5m 37s
Format check	44s
Unit tests (ubuntu-latest)	1m 17s
Unit tests (macos-latest)	1m 6s
Unit tests (windows-latest)	2m 30s
E2E tests (windows-latest)	14m 20s
E2E tests (ubuntu-latest)	8m 3s
Build	1m 30s
Integration tests (ubuntu-latest)	1m 37s
E2E tests (macos-latest)	9m 44s
Integration tests (windows-latest)	3m 3s
Integration tests (macos-latest)	1m 33s
	51m 4s

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