build(deps-dev): bump pytest from 6.1.1 to 6.1.2 in /backend

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.1.1...6.1.2)

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

Author: dependabot[bot]

backend/requirements-dev.txt

@@ -1,5 +1,5 @@
 fakeredis==1.4.4
 pre-commit==2.7.1
-pytest==6.1.1
+pytest==6.1.2
 pytest-responses==0.4.0
 responses==0.12.0