Bump version to "v20.1.6" with changelog. #7302

Job	Run time
build	6m 6s
analyze	5s
lint	2m 14s
test	9m 45s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 24s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	6m 18s
e2e (ubuntu-latest, 22, npm, 5)	9m 40s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	5m 45s
e2e (ubuntu-latest, 22, npm, 0)	9m 15s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 33s
e2e (ubuntu-latest, 22, npm, 2)	10m 22s
e2e-windows-subset	52s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 13s
e2e (ubuntu-latest, 22, esbuild, 1)	8m 58s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 21s
e2e (ubuntu-latest, 22, npm, 1)	11m 40s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 44s
e2e (ubuntu-latest, 22, npm, 3)	9m 26s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 8s
e2e (ubuntu-latest, 22, esbuild, 2)	9m 8s
e2e (ubuntu-latest, 22, npm, 4)	7m 38s
e2e (ubuntu-latest, 22, esbuild, 0)	6m 55s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 53s
e2e-snapshots	0s
	2h 38m 23s

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