Bump version to "v20.3.12" with changelog. #10265

Job	Run time
analyze	7s
build-e2e-windows-subset	5m 41s
lint	2m 24s
build	5m 31s
test	3m 22s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	5m 49s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 41s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 29s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 42s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 12s
e2e (ubuntu-latest, 22, npm, 0)	10m 30s
e2e (ubuntu-latest, 22, npm, 1)	9m 6s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 30s
e2e (ubuntu-latest, 22, npm, 3)	8m 4s
e2e (ubuntu-latest, 22, npm, 4)	9m 23s
e2e (ubuntu-latest, 22, npm, 2)	10m 30s
e2e (ubuntu-latest, 22, esbuild, 5)	7m 1s
e2e (ubuntu-latest, 22, esbuild, 0)	8m 40s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 19s
e2e (ubuntu-latest, 22, npm, 5)	12m 4s
e2e (ubuntu-latest, 22, esbuild, 1)	10m 8s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 40s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 18s
e2e-snapshots	0s
e2e-windows-subset	3m 48s
	2h 46m 59s

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