vmdeps: add python3-dnf for now

[dustymabe]

OSBuild dropped dnf as a dependency upstream [1] but osbuild-mpp still uses python3-dnf. Let's add the dep here until it's added as a dep on osbuild-tools upstream [2].

[1] osbuild/osbuild#1896
[2] osbuild/osbuild#1908

[ravanelli]

LGTM

[mike-nguyen]

/test images

[dustymabe]

/retest ci/prow/images

[openshift-ci]

@dustymabe: The /retest command does not accept any targets.
The following commands are available to trigger required jobs:

• /test images
• /test rhcos

Use /test all to run all jobs.

In response to this:

/retest ci/prow/images

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[dustymabe]

/test images

[openshift-ci]

@dustymabe: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/images	3f0a1aa	link	true	/test images

Full PR test history. Your PR dashboard.

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. I understand the commands that are listed here.