Retire OatmealQuickening/PostLowering #55

Job	Run time
build-20_04	1h 11m 21s
build-deb_stable	1h 13m 58s
build-deb_unstable	1h 12m 14s
build-deb_oldoldstable	1h 12m 57s
build-deb_stable-w-clang-llvm-org (0)	1h 5m 8s
build-deb_stable-w-clang-llvm-org_nightly	0s
build-deb_stable-w-clang-llvm-org (15)	1h 4m 15s
build-windows-artifacts	0s
build-deb_stable-w-clang-llvm-org (17)	1h 6m 18s
build-windows	37m 20s
	8h 43m 31s

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