Update pre-commit requirement from 3.7.0 to 3.8.0 in /backend

Updates the requirements on [pre-commit](https://github.com/pre-commit/pre-commit) to permit the latest version.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/main/CHANGELOG.md)
- [Commits](pre-commit/pre-commit@v3.7.0...v3.8.0)

---
updated-dependencies:
- dependency-name: pre-commit
  dependency-type: direct:development
...

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

backend/pyproject.toml

@@ -65,7 +65,7 @@ sqlalchemy = "2.0.29"
 trio = "0.25.0"
 uvicorn = "0.29.0"
 openai = "1.35.7"
-pre-commit="3.7.0"
+pre-commit="3.8.0"
 pytest="8.1.1"
 datasets = "2.18.0"