Bump version to "v20.3.7" with changelog. #9351

Job	Run time
analyze	5s
lint	2m 26s
build	5m 12s
build-e2e-windows-subset	5m 23s
e2e (ubuntu-latest, 22, npm, 2)	10m 16s
test	5m 44s
e2e (ubuntu-latest, 22, npm, 0)	14m 42s
e2e (ubuntu-latest, 22, npm, 1)	9m 26s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 44s
e2e (ubuntu-latest, 22, npm, 3)	8m 28s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 14s
e2e (ubuntu-latest, 22, esbuild, 1)	9m 42s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 57s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	6m 50s
e2e (ubuntu-latest, 22, esbuild, 0)	8m 37s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 56s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 9s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	10m 1s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 54s
e2e (ubuntu-latest, 22, npm, 5)	12m 16s
e2e (ubuntu-latest, 22, npm, 4)	9m 46s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 52s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 22s
e2e-snapshots	-1s
e2e-windows-subset	5m 4s
	2h 58m 5s

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