Bump httpcore from 1.0.5 to 1.0.7

Bumps [httpcore](https://github.com/encode/httpcore) from 1.0.5 to 1.0.7.
- [Release notes](https://github.com/encode/httpcore/releases)
- [Changelog](https://github.com/encode/httpcore/blob/master/CHANGELOG.md)
- [Commits](https://github.com/encode/httpcore/compare/1.0.5...1.0.7)

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

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

backend/requirements.txt

@@ -10,7 +10,7 @@ django-cors-headers==4.4.0
 djangorestframework==3.15.2
 gunicorn==23.0.0
 h11==0.14.0
-httpcore==1.0.5
+httpcore==1.0.7
 httpx==0.27.2
 idna==3.10
 openai==1.50.2