Bump version to "v20.1.0" with changelog. #6692

Job	Run time
analyze	6s
lint	2m 16s
build	3m 6s
test	2m 25s
e2e-windows-subset	13m 11s
e2e (ubuntu-latest, 22, npm, 0)	10m 10s
e2e (ubuntu-latest, 22, npm, 2)	10m 42s
e2e (ubuntu-latest, 22, npm, 5)	9m 53s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 15s
e2e (ubuntu-latest, 22, esbuild, 2)	9m 11s
e2e (ubuntu-latest, 22, npm, 4)	7m 52s
e2e (ubuntu-latest, 22, esbuild, 0)	7m 7s
e2e (ubuntu-latest, 22, esbuild, 5)	5m 57s
e2e (ubuntu-latest, 22, esbuild, 1)	9m 15s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 55s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 39s
e2e (ubuntu-latest, 22, npm, 3)	9m 13s
e2e (ubuntu-latest, 22, npm, 1)	11m 9s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 7s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	6m 13s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 19s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 52s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 14s
e2e-snapshots	0s
	2h 42m 7s

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