Bump alembic from 1.7.7 to 1.9.0 (#156)

Bumps [alembic](https://github.com/sqlalchemy/alembic) from 1.7.7 to 1.9.0.
- [Release notes](https://github.com/sqlalchemy/alembic/releases)
- [Changelog](https://github.com/sqlalchemy/alembic/blob/main/CHANGES)
- [Commits](https://github.com/sqlalchemy/alembic/commits)

---
updated-dependencies:
- dependency-name: alembic
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 Flask_SQLAlchemy==2.5.1
 SQLAlchemy==1.4.40
-alembic==1.7.7
+alembic==1.9.0
 Flask_Login==0.6.0
 Flask_Testing==0.8.1
 Flask==2.0.2