consider only writing dependencies in tags

[dsschult]

The dependency files create lots of spurious merge conflicts, so don't write them to main. Instead, during the release process, write them to the local repo before a tag branch gets pushed. This essentially adds files only to the tag.

Slack discussion: https://icecube-spno.slack.com/archives/CAH0NDF8B/p1713563069877149

The assets feature of python-semantic-release is supposed to do this:
https://python-semantic-release.readthedocs.io/en/latest/configuration.html#assets-list-str