Bump importlib-metadata from 8.6.1 to 8.7.0 in /back-end

Bumps [importlib-metadata](https://github.com/python/importlib_metadata) from 8.6.1 to 8.7.0.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/NEWS.rst)
- [Commits](python/importlib_metadata@v8.6.1...v8.7.0)

---
updated-dependencies:
- dependency-name: importlib-metadata
  dependency-version: 8.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

back-end/requirements.txt

@@ -7,7 +7,7 @@ fastapi==0.115.12
 h11==0.14.0
 idna==3.10
 immutables==0.21
-importlib-metadata==8.6.1
+importlib-metadata==8.7.0
 pydantic==2.11.3
 python-multipart==0.0.20
 six==1.17.0