Fix the infinitely looping `Errors` shrinker #322

Job	Run time
stylish-haskell (9.6.6, 3.12.1.0, ubuntu-latest)	2m 32s
build (8.10.7, 3.12.1.0, ubuntu-latest)	4m 58s
cabal-check (9.6.6, 3.10.3.0, ubuntu-latest)	2m 48s
build (8.10.7, 3.12.1.0, windows-latest)	7m 44s
cabal-fmt (9.6.6, 3.12.1.0, ubuntu-latest)	2m 54s
build (8.10.7, 3.12.1.0, macOS-13)	7m 37s
build (9.2.8, 3.12.1.0, ubuntu-latest)	4m 42s
build (9.2.8, 3.12.1.0, windows-latest)	7m 15s
build (9.2.8, 3.12.1.0, macOS-13)	8m 6s
build (9.4.8, 3.12.1.0, ubuntu-latest)	5m 42s
build (9.4.8, 3.12.1.0, windows-latest)	7m 10s
build (9.4.8, 3.12.1.0, macOS-13)	15m 33s
build (9.6.6, 3.12.1.0, ubuntu-latest)	5m 8s
build (9.6.6, 3.12.1.0, windows-latest)	7m 14s
build (9.6.6, 3.12.1.0, macOS-13)	15m 22s
build (9.8.2, 3.12.1.0, ubuntu-latest)	5m 35s
build (9.8.2, 3.12.1.0, windows-latest)	9m 0s
build (9.8.2, 3.12.1.0, macOS-13)	11m 29s
build (9.10.1, 3.12.1.0, ubuntu-latest)	3m 5s
build (9.10.1, 3.12.1.0, windows-latest)	6m 7s
build (9.10.1, 3.12.1.0, macOS-13)	12m 6s
build (9.6.6, 3.12.1.0, ubuntu-latest, no-debug)	5m 0s
	2h 37m 7s

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