Bump version to "v20.3.19" with changelog. #12251

Job	Run time
analyze	8s
build-e2e-windows-subset	7m 51s
build	7m 32s
lint	2m 39s
test	3m 57s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 56s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 31s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 7s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 8s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	5m 6s
e2e (ubuntu-latest, 22, npm, 1)	9m 21s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 36s
e2e (ubuntu-latest, 22, npm, 2)	10m 46s
e2e (ubuntu-latest, 22, esbuild, 0)	9m 12s
e2e (ubuntu-latest, 22, npm, 3)	9m 36s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 57s
e2e (ubuntu-latest, 22, esbuild, 1)	12m 46s
e2e (ubuntu-latest, 22, npm, 4)	9m 55s
e2e (ubuntu-latest, 22, npm, 5)	15m 45s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 44s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 48s
e2e (ubuntu-latest, 22, npm, 0)	11m 23s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 58s
e2e-snapshots	0s
e2e-windows-subset	4m 18s
	3h 5m 0s

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