Bump psycopg2-binary from 2.9.2 to 2.9.3 in /requirements

Bumps [psycopg2-binary](https://github.com/psycopg/psycopg2) from 2.9.2 to 2.9.3.
- [Release notes](https://github.com/psycopg/psycopg2/releases)
- [Changelog](https://github.com/psycopg/psycopg2/blob/master/NEWS)
- [Commits](https://github.com/psycopg/psycopg2/commits)

---
updated-dependencies:
- dependency-name: psycopg2-binary
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/postgres.txt

@@ -1 +1 @@
-psycopg2-binary==2.9.2
+psycopg2-binary==2.9.3