Use `sysbox-runc` as runtime class for sysbox shells

[michaeljguarino]

Summary

Apparently that's the name we need to use for this, so minor change

Test Plan

unit

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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