chore: update Nx to v21 #6329

Job	Run time
Integration tests (ubuntu-latest)	1m 33s
Format check	34s
Integration tests (windows-latest)	1m 31s
Integration tests (macos-latest)	45s
Linter	5m 37s
Unit tests (windows-latest)	2m 5s
Unit tests (ubuntu-latest)	37s
E2E tests (windows-latest)	12m 57s
Unit tests (macos-latest)	54s
Build	1m 28s
E2E tests (ubuntu-latest)	7m 8s
E2E tests (macos-latest)	8m 35s
	43m 44s

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