gomod: bump golang.org/x/tools from 0.25.0 to 0.26.0 in /cmd/cligen #81

Job	Run time
ci / resolve-modules / resolve-modules	3s
ci / lint (./testing)	23s
ci / lint (./cmd/cligen)	34s
ci / lint (./cmd/examples)	37s
ci / lint (.)	24s
ci / generate (./testing)	14s
ci / generate (./cmd/cligen)	22s
ci / mod-tidy (./testing)	17s
ci / generate (./cmd/examples)	24s
ci / mod-tidy (./cmd/cligen)	17s
ci / mod-tidy (./cmd/examples)	17s
ci / generate (.)	14s
ci / mod-tidy (.)	13s
ci / build-and-test (./testing)	17s
ci / build-and-test (./cmd/cligen)	17s
ci / build-and-test (./cmd/examples)	14s
ci / build-and-test (.)	14s
	5m 21s

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