Bump version to "v20.3.8" with changelog. #9528

Job	Run time
lint	2m 36s
build-e2e-windows-subset	7m 23s
analyze	7s
build	7m 8s
test	3m 46s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	5m 6s
e2e-snapshots	0s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	9m 48s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 47s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	6m 59s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 14s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 9s
e2e (ubuntu-latest, 22, npm, 1)	9m 24s
e2e (ubuntu-latest, 22, npm, 2)	10m 38s
e2e (ubuntu-latest, 22, npm, 5)	12m 47s
e2e (ubuntu-latest, 22, npm, 4)	9m 59s
e2e (ubuntu-latest, 22, npm, 0)	11m 25s
e2e (ubuntu-latest, 22, esbuild, 1)	9m 29s
e2e (ubuntu-latest, 22, esbuild, 0)	8m 43s
e2e (ubuntu-latest, 22, npm, 3)	8m 43s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 51s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 9s
e2e (ubuntu-latest, 22, esbuild, 5)	7m 20s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 39s
e2e-windows-subset	4m 42s
	2h 58m 52s

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