build(deps-dev): bump psycopg2-binary from 2.9.5 to 2.9.6 (#591)

Bumps [psycopg2-binary](https://github.com/psycopg/psycopg2) from 2.9.5 to 2.9.6.
- [Release notes](https://github.com/psycopg/psycopg2/releases)
- [Changelog](https://github.com/psycopg/psycopg2/blob/master/NEWS)
- [Commits](https://github.com/psycopg/psycopg2/commits/2.9.6)

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

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

Author: dependabot[bot]

demos/graphql-demo/requirements-dev.txt

@@ -8,7 +8,7 @@ trafaret_config==2.0.2
 graphene==2.1.9
 graphql-core==2.3.2
 graphql-ws==0.4.4
-psycopg2-binary==2.9.5
+psycopg2-binary==2.9.6
 redis==4.5.4
 
 mypy==1.1.1