gomod: bump github.com/sanity-io/litter in /cmd/cligen #111

Job	Run time
ci / resolve-modules / resolve-modules	2s
ci / build-and-test (.)	22s
ci / build-and-test (./testing)	20s
ci / build-and-test (./cmd/cligen)	26s
ci / build-and-test (./cmd/examples)	26s
ci / generate (.)	13s
ci / generate (./testing)	10s
ci / generate (./cmd/cligen)	21s
ci / lint (.)	17s
ci / generate (./cmd/examples)	23s
ci / lint (./testing)	20s
ci / lint (./cmd/cligen)	27s
ci / mod-tidy (.)	10s
ci / lint (./cmd/examples)	25s
ci / mod-tidy (./testing)	11s
ci / mod-tidy (./cmd/cligen)	15s
ci / mod-tidy (./cmd/examples)	15s
	5m 3s

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