`auto shipit --dry-run` gives different results than `auto shipit` without `--dry-run`

[jwodder]

We have a GitHub workflow that runs auto shipit --dry-run --quiet and captures the output in order to determine if auto is about to make a release; if it is, we run various custom steps before actually releasing with auto shipit -vv. However, our most recent attempt at a release failed because, although the --dry-run command output a new version, the final auto shipit command determined that no release was due. The relevant workflow logs can be downloaded here.