chore(deps): update charset-normalizer requirement

Updates the requirements on [charset-normalizer](https://github.com/jawah/charset_normalizer) to permit the latest version.
- [Release notes](https://github.com/jawah/charset_normalizer/releases)
- [Changelog](https://github.com/jawah/charset_normalizer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jawah/charset_normalizer/compare/3.4.7...3.4.8)

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

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

backend/python/vllm/requirements.txt

@@ -3,5 +3,5 @@ protobuf
 certifi
 setuptools
 pillow
-charset-normalizer>=3.4.7
+charset-normalizer>=3.4.8
 chardet