Bump version to "v20.3.29" with changelog. #14493

Job	Run time
build	7m 10s
analyze	5s
build-e2e-windows-subset	7m 29s
lint	2m 41s
test	3m 54s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	10m 58s
e2e (ubuntu-latest, 22, esbuild, 5)	7m 9s
e2e (ubuntu-latest, 22, esbuild, 2)	9m 14s
e2e (ubuntu-latest, 22, npm, 4)	11m 12s
e2e (ubuntu-latest, 22, npm, 3)	8m 54s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 35s
e2e (ubuntu-latest, 22, npm, 0)	11m 29s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 17s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 57s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 42s
e2e (ubuntu-latest, 22, npm, 5)	12m 56s
e2e (ubuntu-latest, 22, esbuild, 1)	8m 57s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	5m 14s
e2e (ubuntu-latest, 22, npm, 1)	12m 55s
e2e (ubuntu-latest, 22, npm, 2)	10m 58s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 50s
e2e (ubuntu-latest, 22, esbuild, 0)	9m 36s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 42s
e2e-snapshots	-1s
e2e-windows-subset	5m 24s
	3h 9m 17s

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