build(deps-dev): bump pytest-responses from 0.5.0 to 0.5.1 in /backend (#1610)

Bumps [pytest-responses](https://github.com/getsentry/pytest-responses) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/getsentry/pytest-responses/releases)
- [Changelog](https://github.com/getsentry/pytest-responses/blob/main/CHANGES)
- [Commits](getsentry/pytest-responses@0.5.0...0.5.1)

---
updated-dependencies:
- dependency-name: pytest-responses
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

Author: dependabot[bot]

backend/requirements-dev.txt

@@ -1,5 +1,5 @@
 fakeredis==1.9.1
 pre-commit==2.20.0
 pytest==7.1.3
-pytest-responses==0.5.0
+pytest-responses==0.5.1
 responses==0.21.0