chore: update Nx to v21 #6337

Job	Run time
Integration tests (macos-latest)	1m 23s
E2E tests (ubuntu-latest)	7m 26s
E2E tests (macos-latest)	6m 38s
Format check	44s
Build	1m 19s
Unit tests (windows-latest)	2m 17s
Linter	5m 56s
E2E tests (windows-latest)	13m 14s
Integration tests (windows-latest)	2m 59s
Unit tests (macos-latest)	1m 4s
Integration tests (ubuntu-latest)	1m 31s
Unit tests (ubuntu-latest)	1m 56s
	46m 27s

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