chore: update Nx to v21 #6310

Job	Run time
Format check	13s
Linter	15s
Integration tests (ubuntu-latest)	14s
Integration tests (windows-latest)	32s
Build	12s
E2E tests (windows-latest)	33s
E2E tests (ubuntu-latest)	13s
Integration tests (macos-latest)	16s
E2E tests (macos-latest)	20s
Unit tests (windows-latest)	32s
Unit tests (ubuntu-latest)	16s
Unit tests (macos-latest)	18s
	3m 54s

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