Bump charset-normalizer from 3.4.7 to 3.4.8 (#447)

Bumps [charset-normalizer](https://github.com/jawah/charset_normalizer) from 3.4.7 to 3.4.8.
- [Release notes](https://github.com/jawah/charset_normalizer/releases)
- [Changelog](https://github.com/jawah/charset_normalizer/blob/master/CHANGELOG.md)
- [Commits](jawah/charset_normalizer@3.4.7...3.4.8)

---
updated-dependencies:
- dependency-name: charset-normalizer
  dependency-version: 3.4.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -2,7 +2,7 @@ asgiref==3.11.1
 astroid==3.3.11
 attrs==26.1.0
 certifi==2026.6.17
-charset-normalizer==3.4.7
+charset-normalizer==3.4.8
 coreschema==0.0.4
 coverage==7.14.3
 defusedxml==0.7.1