Bump version to "v20.3.31" with changelog. #14681

Job	Run time
build-e2e-windows-subset	7m 49s
build	7m 31s
lint	3m 16s
analyze	7s
test	3m 53s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 0s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 42s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 56s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	5m 44s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 23s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	8m 15s
e2e (ubuntu-latest, 22, npm, 4)	9m 47s
e2e (ubuntu-latest, 22, npm, 0)	11m 44s
e2e (ubuntu-latest, 22, npm, 3)	8m 22s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 59s
e2e (ubuntu-latest, 22, npm, 1)	9m 4s
e2e (ubuntu-latest, 22, npm, 2)	10m 45s
e2e (ubuntu-latest, 22, esbuild, 5)	7m 6s
e2e (ubuntu-latest, 22, esbuild, 0)	10m 4s
e2e (ubuntu-latest, 22, esbuild, 4)	7m 1s
e2e (ubuntu-latest, 22, esbuild, 1)	10m 24s
e2e (ubuntu-latest, 22, esbuild, 2)	9m 31s
e2e (ubuntu-latest, 22, npm, 5)	12m 29s
e2e-snapshots	-1s
e2e-windows-subset	4m 34s
	3h 0m 25s

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