Bump psycopg2cffi from 2.8.1 to 2.9.0

Bumps [psycopg2cffi](https://github.com/chtd/psycopg2cffi) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/chtd/psycopg2cffi/releases)
- [Commits](chtd/psycopg2cffi@2.8.1...2.9.0)

---
updated-dependencies:
- dependency-name: psycopg2cffi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -8,7 +8,7 @@ numpy==1.19.5
 pandas==1.1.5
 ply==3.11
 psycopg2==2.9.3
-psycopg2cffi==2.8.1
+psycopg2cffi==2.9.0
 pycparser==2.20
 python-dateutil==2.8.1
 pytz==2021.1