Bump httpx from 0.24.1 to 0.27.0

Bumps [httpx](https://github.com/encode/httpx) from 0.24.1 to 0.27.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](https://github.com/encode/httpx/compare/0.24.1...0.27.0)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -7,7 +7,7 @@ langchain-experimental==0.0.55
 backoff==2.2.1
 toml
 pypdf==4.1.0
-httpx==0.24.1
+httpx==0.27.0
 ratelimit==2.2.1
 loguru==0.7.2
 pydantic==2.6.4