Add version discovery for cri-tools and kubernetes-cni packages

[xmudrii]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add version discovery to the krel obs specs command for cri-tools and kubernetes-cni packages. If the version is not provided, the latest version will be fetched from GitHub and used to create the package sources and specs. Prior to this change, if the version wasn't provided, the command would fail. This change is making it easier to implement tests.

Which issue(s) this PR fixes:

Required for #3589

Special notes for your reviewer:

This PR requires kubernetes-sigs/release-utils#104. I bumped the dependency to the latest revision, but we might want to do a new release-utils release as well.

Does this PR introduce a user-facing change?

Add version discovery to the `krel obs specs` command for `cri-tools` and `kubernetes-cni` packages

/assign @cpanato @saschagrunert @puerco
cc @kubernetes/release-engineering

[cpanato]

nice

thanks!
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, xmudrii

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[cpanato]

/skip

[cpanato]

/override "Dependency Review / dependency-review (pull_request)"

[k8s-ci-robot]

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[cpanato]

/override "dependency-review"

[k8s-ci-robot]

@cpanato: /override requires failed status contexts, check run or a prowjob name to operate on.
The following unknown contexts/checkruns were given:

• dependency-review

Only the following failed contexts/checkruns were expected:

• EasyCLA
• pull-release-integration-test
• pull-release-test
• pull-release-verify
• tide

If you are trying to override a checkrun that has a space in it, you must put a double quote on the context.

In response to this:

/override "dependency-review"

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.