Bump version to "v20.3.26" with changelog. #13899

Job	Run time
lint	2m 35s
analyze	7s
build	6m 34s
build-e2e-windows-subset	6m 48s
test	3m 23s
e2e-package-managers (ubuntu-latest, 22, yarn, 0)	7m 37s
e2e-package-managers (ubuntu-latest, 22, pnpm, 0)	6m 3s
e2e-package-managers (ubuntu-latest, 22, yarn, 1)	6m 17s
e2e-package-managers (ubuntu-latest, 22, pnpm, 1)	4m 50s
e2e-package-managers (ubuntu-latest, 22, yarn, 2)	7m 36s
e2e-package-managers (ubuntu-latest, 22, pnpm, 2)	5m 14s
e2e (ubuntu-latest, 22, npm, 1)	9m 6s
e2e (ubuntu-latest, 22, esbuild, 3)	8m 43s
e2e (ubuntu-latest, 22, esbuild, 4)	6m 9s
e2e (ubuntu-latest, 22, npm, 5)	12m 2s
e2e (ubuntu-latest, 22, esbuild, 5)	6m 57s
e2e (ubuntu-latest, 22, npm, 2)	9m 58s
e2e (ubuntu-latest, 22, esbuild, 2)	8m 22s
e2e (ubuntu-latest, 22, npm, 0)	11m 23s
e2e (ubuntu-latest, 22, npm, 4)	9m 29s
e2e (ubuntu-latest, 22, npm, 3)	7m 59s
e2e (ubuntu-latest, 22, esbuild, 1)	10m 23s
e2e (ubuntu-latest, 22, esbuild, 0)	9m 28s
e2e-snapshots	-1s
e2e-windows-subset	6m 15s
	2h 53m 17s

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