fix: local_version flag is incorrect

Make sure major and minor tags are up to date on a patch release.

This would allow the common practice to use major tag on the action:

```yaml
- name: Create bump and changelog
  uses: commitizen-tools/commitizen-action@0
```

(Ideally you may want to prefix version with `v` 🤷)

This what this third party action does under the hood:

```bash
$ TAG="0.21.0"
$ MINOR="${TAG%.*}"
$ echo $MINOR
0.21
$ MAJOR="${MINOR%.*}"
$ echo $MAJOR
0
```

This is used here for example: https://github.com/astral-sh/setup-uv/blob/main/.github/workflows/update-major-minor-tags.yml

ci: publish major and minor tags

feat: add support for manual version bumping