chore(deps): update httpx requirement in /packages/http/httpx

Updates the requirements on [httpx](https://github.com/encode/httpx) to permit the latest version.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.23.0...0.28.0)

---
updated-dependencies:
- dependency-name: httpx
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/http/httpx/pyproject.toml

@@ -29,7 +29,7 @@ python = ">=3.8,<4.0"
 microsoft-kiota-abstractions = {path="../../abstractions/", develop=true}
 opentelemetry-api = ">=1.27.0"
 opentelemetry-sdk = ">=1.27.0"
-httpx = {extras = ["http2"], version = ">=0.23,<0.28"}
+httpx = {extras = ["http2"], version = ">=0.23,<0.29"}
 urllib3 = "^2.2.2"
 
 [tool.poetry.group.dev.dependencies]