Bump version to "v20.3.16" with changelog. #11646

Job	Run time
build	5m 11s
build-e2e-windows-subset	5m 25s
analyze	7s
lint	2m 43s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 39s
e2e (ubuntu-latest, 22, npm, 3)	8m 15s
test	3m 31s
e2e (ubuntu-latest, 22, esbuild, 0)	8m 11s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	5m 59s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 56s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 31s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 48s
e2e (ubuntu-latest, 22, npm, 2)	10m 17s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 9s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 48s
e2e (ubuntu-latest, 22, npm, 5)	12m 19s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	5m 7s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 27s
e2e (ubuntu-latest, 22, npm, 4)	9m 39s
e2e (ubuntu-latest, 22, npm, 1)	9m 4s
e2e (ubuntu-latest, 22, npm, 0)	10m 45s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 16s
e2e (ubuntu-latest, 22, esbuild, 1)	10m 15s
e2e-snapshots	0s
e2e-windows-subset	3m 47s
	2h 48m 9s

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