Auto-file issues for new TUF versions

[znewman01]

python-tuf gets automatic issues requesting review of new TUF versions (theupdateframework/python-tuf#1992). That seems useful here.

Seems like it comes from https://github.com/theupdateframework/python-tuf/blob/1efd52c7c403daee9e9f2e1c6d587d349aac147b/.github/workflows/specification-version.yml

Which could be abstracted out into a theupdateframework/specification-bump action.

[joshuagl]

That would be great. We could implement the checking of a release and comparing it to an input value in a reusable workflow (within the specification repository?) and each TUF implementation that cares to can reuse the workflow and will only need to figure out how to pass the implemented version of the specification https://github.com/theupdateframework/python-tuf/blob/1efd52c7c403daee9e9f2e1c6d587d349aac147b/.github/workflows/specification-version.yml#L22-L26

[rdimitrov]

Sounds great 👍 I can draft a PR for stripping that into a reusable workflow and apply the necessary patches to current TUF implementations.