Update httpx requirement from ~=0.26.0 to ~=0.27.0 in /code/function

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@0.26.0...0.27.0)

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

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

Author: dependabot[bot]

code/function/requirements.txt

@@ -6,7 +6,7 @@
 azure-functions~=1.18.0
 fastapi~=0.109.2
 pydantic-settings~=2.2.1
-httpx~=0.26.0
+httpx~=0.27.0
 azure-monitor-opentelemetry-exporter==1.0.0b22
 opentelemetry-instrumentation-fastapi==0.43b0
 opentelemetry-instrumentation-httpx~=0.43b0