build(deps-dev): bump responses from 0.25.2 to 0.25.3 in /backend

Bumps [responses](https://github.com/getsentry/responses) from 0.25.2 to 0.25.3.
- [Release notes](https://github.com/getsentry/responses/releases)
- [Changelog](https://github.com/getsentry/responses/blob/master/CHANGES)
- [Commits](getsentry/responses@0.25.2...0.25.3)

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

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

Author: dependabot[bot]

backend/requirements-dev.txt

@@ -2,4 +2,4 @@ fakeredis==2.23.3
 pre-commit==3.5.0
 pytest==8.2.2
 pytest-responses==0.5.1
-responses==0.25.2
+responses==0.25.3