Bump version to "v20.0.0-next.6" with changelog. #5345

Job	Run time
build	4m 52s
analyze	6s
lint	2m 8s
test	3m 15s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	6m 0s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 21s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	5m 16s
e2e (ubuntu-latest, 22, npm, 5)	9m 38s
e2e (ubuntu-latest, 22, npm, 4)	8m 14s
e2e (ubuntu-latest, 22, npm, 0)	9m 55s
e2e-windows-subset	10m 43s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	5m 47s
e2e (ubuntu-latest, 22, esbuild, 2)	9m 31s
e2e (ubuntu-latest, 22, npm, 3)	9m 7s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 26s
e2e (ubuntu-latest, 22, esbuild, 0)	7m 31s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 24s
e2e (ubuntu-latest, 22, npm, 2)	10m 33s
e2e (ubuntu-latest, 22, esbuild, 4)	7m 32s
e2e (ubuntu-latest, 22, esbuild, 1)	10m 28s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 31s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 12s
e2e (ubuntu-latest, 22, npm, 1)	11m 40s
e2e-snapshots	-1s
	2h 44m 9s

Provide feedback