Bump flask-migrate from 3.0.1 to 4.0.4

Bumps [flask-migrate](https://github.com/miguelgrinberg/flask-migrate) from 3.0.1 to 4.0.4.
- [Release notes](https://github.com/miguelgrinberg/flask-migrate/releases)
- [Changelog](https://github.com/miguelgrinberg/Flask-Migrate/blob/main/CHANGES.md)
- [Commits](https://github.com/miguelgrinberg/flask-migrate/compare/v3.0.1...v4.0.4)

---
updated-dependencies:
- dependency-name: flask-migrate
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

setup.py

@@ -37,7 +37,7 @@ setup(
     install_requires=[
         'Flask==2.0.1',
         'Flask-SQLAlchemy==2.5.1',
-        'Flask-Migrate==3.0.1',
+        'Flask-Migrate==4.0.4',
         'Flask-Bootstrap==3.3.7.1',
         'Flask-WTF==0.15.1',
         'Flask-Caching==1.10.1',