Bump version to "v20.0.6" with changelog. #6677

Job	Run time
build	2m 46s
lint	2m 22s
analyze	8s
test	13m 10s
e2e-windows-subset	15m 51s
e2e (ubuntu-latest, 22, npm, 4)	8m 46s
e2e (ubuntu-latest, 22, npm, 2)	11m 33s
e2e (ubuntu-latest, 22, esbuild, 1)	10m 19s
e2e (ubuntu-latest, 22, npm, 0)	12m 39s
e2e (ubuntu-latest, 22, esbuild, 4)	8m 15s
e2e (ubuntu-latest, 22, esbuild, 0)	8m 36s
e2e (ubuntu-latest, 22, npm, 3)	10m 19s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 53s
e2e (ubuntu-latest, 22, esbuild, 2)	10m 34s
e2e (ubuntu-latest, 22, npm, 1)	12m 25s
e2e (ubuntu-latest, 22, esbuild, 3)	9m 38s
e2e (ubuntu-latest, 22, npm, 5)	10m 49s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 57s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 17s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	5m 35s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	6m 27s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	8m 45s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 43s
e2e-snapshots	-1s
	3h 16m 46s

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