Bump config-cleanup plugin

[dbkegley]

Bumps the config-cleanup plugin version from 0.6.0 -> 0.7.0

Unfortunately I also had to update the source repo path because the original org was renamed and the repos were migrated. I no longer work for the the original org but I am the author of the plugin and the current maintainer

[ahmetb]

🤖 Beep beep! I’m a robot speaking on behalf of @ahmetb. 🤖

---

This pull request does not seem to be a straightforward version bump. I'll have a human review this. If we don't respond within a day, feel free to ping us.

Why wasn't this detected as a plugin version bump:

file plugins/config-cleanup.yaml is not a straightforward version bump: change on line 10 does not seem like a version bump: [- homepage: https://github.com/B23admin/kubectl-config-cleanup]
/kind plugin-update

[k8s-ci-robot]

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[dbkegley]

@chriskim06 just bumping this PR. I haven’t made any updates to the plugin for quite a while so please let me know if I missed any steps when creating this PR