Bump future from 0.18.2 to 0.18.3

Bumps [future](https://github.com/PythonCharmers/python-future) from 0.18.2 to 0.18.3.
- [Release notes](https://github.com/PythonCharmers/python-future/releases)
- [Changelog](https://github.com/PythonCharmers/python-future/blob/master/docs/changelog.rst)
- [Commits](PythonCharmers/python-future@v0.18.2...v0.18.3)

---
updated-dependencies:
- dependency-name: future
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ Flask-Login==0.6.2
 Flask-Migrate==3.1.0
 Flask-pyoidc==3.11.0
 Flask-SQLAlchemy==3.0.2
-future==0.18.2
+future==0.18.3
 greenlet==1.1.3.post0
 gunicorn==20.1.0
 idna==3.4