Bump ruff from 0.8.6 to 0.9.1 in /apps/api (#768)

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.8.6 to 0.9.1.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.8.6...0.9.1)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

apps/api/Pipfile

@@ -17,7 +17,7 @@ requests = "==2.32.3"
 uvicorn = {extras = ["standard"], version = "*"}
 pytest = "==8.3.4"
 httpx = "==0.28.1"
-ruff = "==0.8.6"
+ruff = "==0.9.1"
 fastapi-analytics = "==1.2.2"
 python-dotenv = "==1.0.1"
 pydantic-settings = "==2.7.1"