Skip gen-cli-docs on depup

[hakman]

This is preventing the dependencies update action to finish and show errors in tests:
https://github.com/kubernetes/kops/actions/runs/7752057353

GOOS=linux GOARCH=amd64 go build  "-trimpath"  -o /home/runner/work/kops/kops/.build/dist/linux/amd64/kops -ldflags=all=" -X k8s.io/kops.Version=1.29.0-alpha.4+1067b62 -X k8s.io/kops.GitVersion=1067b62" k8s.io/kops/cmd/kops
KOPS_STATE_STORE= \
KOPS_FEATURE_FLAGS= \
/home/runner/work/kops/kops/.build/dist/linux/amd64/kops gen-cli-docs --out docs/cli
Error: cannot merge resource due to conflicting Schema URL
make: *** [Makefile:276: gen-cli-docs] Error 1
Error: Process completed with exit code 2.

/cc @rifelpet @justinsb

[justinsb]

Thanks, and agree this doesn't feel related to dependency updates.

/approve
/lgtm

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