Bump pip-tools from 7.2.0 to 7.3.0 in /backend

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 7.2.0 to 7.3.0.
- [Release notes](https://github.com/jazzband/pip-tools/releases)
- [Changelog](https://github.com/jazzband/pip-tools/blob/main/CHANGELOG.md)
- [Commits](jazzband/pip-tools@7.2.0...7.3.0)

---
updated-dependencies:
- dependency-name: pip-tools
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

backend/dev-requirements.txt

@@ -12,7 +12,7 @@ click==8.1.3
     # via pip-tools
 packaging==23.1
     # via build
-pip-tools==7.2.0
+pip-tools==7.3.0
     # via -r dev-requirements.in
 pycodestyle==2.10.0
     # via autopep8