build(deps): bump g4f[slim] from 0.6.0.3 to 0.6.4.0

Bumps [g4f[slim]](https://github.com/xtekky/gpt4free) from 0.6.0.3 to 0.6.4.0.
- [Release notes](https://github.com/xtekky/gpt4free/releases)
- [Commits](xtekky/gpt4free@0.6.0.3...0.6.4.0)

---
updated-dependencies:
- dependency-name: g4f[slim]
  dependency-version: 0.6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -3,4 +3,4 @@ loguru==0.7.3
 pydantic==2.8.2
 pydantic-settings==2.4.0
 pydantic_core==2.20.1
-g4f[slim]==0.6.0.3
+g4f[slim]==0.6.4.0