chore: update Nx to v21 #6313

Job	Run time
Linter	2m 32s
Format check	37s
Unit tests (ubuntu-latest)	40s
Unit tests (macos-latest)	44s
Integration tests (ubuntu-latest)	42s
Integration tests (macos-latest)	41s
Integration tests (windows-latest)	1m 43s
Unit tests (windows-latest)	1m 28s
E2E tests (ubuntu-latest)	6m 44s
Build	1m 23s
E2E tests (windows-latest)	13m 33s
E2E tests (macos-latest)	6m 42s
	37m 29s

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