Bump version to "v21.0.0-rc.3" with changelog. #9926

Job	Run time
lint	2m 34s
analyze	4s
build	5m 3s
build-e2e-windows-subset	5m 16s
test	3m 35s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 49s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 29s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 28s
e2e (ubuntu-latest, 22, npm, 1)	11m 47s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	8m 33s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 16s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 49s
e2e (ubuntu-latest, 22, npm, 0)	11m 13s
e2e (ubuntu-latest, 22, npm, 4)	8m 41s
e2e (ubuntu-latest, 22, npm, 5)	9m 52s
e2e (ubuntu-latest, 22, npm, 3)	7m 40s
e2e (ubuntu-latest, 22, esbuild, 1)	9m 24s
e2e (ubuntu-latest, 22, esbuild, 0)	7m 36s
e2e (ubuntu-latest, 22, esbuild, 5)	7m 11s
e2e (ubuntu-latest, 22, npm, 2)	10m 44s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 4s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 28s
e2e (ubuntu-latest, 22, esbuild, 2)	9m 38s
e2e-snapshots	0s
e2e-windows-subset	5m 27s
	2h 49m 41s

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