Bump flask-migrate from 2.7.0 to 3.1.0

Bumps [flask-migrate](https://github.com/miguelgrinberg/flask-migrate) from 2.7.0 to 3.1.0.
- [Release notes](https://github.com/miguelgrinberg/flask-migrate/releases)
- [Changelog](https://github.com/miguelgrinberg/Flask-Migrate/blob/main/CHANGES.md)
- [Commits](miguelgrinberg/Flask-Migrate@v2.7.0...v3.1.0)

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

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

Author: dependabot[bot]

poetry.lock

@@ -14,7 +14,7 @@ click = "7.1.2"
 flake8 = "3.9.0"
 flask = "1.1.2"
 Flask-Cors = "3.0.10"
-Flask-Migrate = "2.7.0"
+Flask-Migrate = "3.1.0"
 prometheus_client = "0.9.0"
 psycopg2-binary = "2.8.6"
 py-healthcheck = "1.10.1"