[api] Bump pylint from 3.3.7 to 3.3.8 in /backend

Bumps [pylint](https://github.com/pylint-dev/pylint) from 3.3.7 to 3.3.8.
- [Release notes](https://github.com/pylint-dev/pylint/releases)
- [Commits](pylint-dev/pylint@v3.3.7...v3.3.8)

---
updated-dependencies:
- dependency-name: pylint
  dependency-version: 3.3.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/poetry.lock

@@ -21,7 +21,7 @@ uvicorn = {extras = ["standard"], version = "^0.35.0"}
 tomli = "^2.2.1"
 
 [tool.poetry.group.dev.dependencies]
-pylint = "^3.3.7"
+pylint = "^3.3.8"
 isort = "^6.0.1"
 pytest = "^8.4.1"
 pytest-mock = "^3.14.1"