Bump alembic from 1.18.2 to 1.18.3 in /server

Bumps [alembic](https://github.com/sqlalchemy/alembic) from 1.18.2 to 1.18.3.
- [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-version: 1.18.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

server/requirements.txt

@@ -6,7 +6,7 @@ marshmallow-sqlalchemy>=1.4.0
 tornado-prometheus==0.1.2
 bcrypt==4.3.0
 anytree==2.13.0
-alembic==1.18.2
+alembic==1.18.3
 marshmallow<5
 pyjwt[crypto]==2.10.1
 setuptools==80.10.2