chore: update Nx to v21 #6318

Job	Run time
Format check	1m 41s
Linter	5m 41s
Unit tests (windows-latest)	2m 21s
Unit tests (ubuntu-latest)	1m 10s
Unit tests (macos-latest)	59s
E2E tests (ubuntu-latest)	7m 50s
Integration tests (windows-latest)	2m 55s
Integration tests (macos-latest)	1m 56s
Build	1m 23s
E2E tests (macos-latest)	6m 44s
Integration tests (ubuntu-latest)	1m 31s
E2E tests (windows-latest)	14m 31s
	48m 42s

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