Bump pip-api from 0.0.30 to 0.0.34 in /backend

Bumps [pip-api](https://github.com/di/pip-api) from 0.0.30 to 0.0.34.
- [Release notes](https://github.com/di/pip-api/releases)
- [Changelog](https://github.com/di/pip-api/blob/master/CHANGELOG)
- [Commits](di/pip-api@0.0.30...0.0.34)

---
updated-dependencies:
- dependency-name: pip-api
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/requirements.txt

@@ -24,7 +24,7 @@ mdurl==0.1.2
 msgpack==1.0.7
 packageurl-python==0.15.0
 packaging==23.2
-pip-api==0.0.30
+pip-api==0.0.34
 pip-requirements-parser==32.0.1
 pip_audit==2.7.2
 py-serializable==1.0.3