Add run_constrained for libprotobuf-python-headers

[xhochy]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[xhochy]

I will mark build 3 as broken 😞

[varlackc]

There is an old pull request for version 24.0, just curious to know how we should address it?

#169

[xhochy]

#169 should be rebased on top of this.