Bump azure-monitor-opentelemetry-exporter in /code/function

Bumps [azure-monitor-opentelemetry-exporter](https://github.com/Azure/azure-sdk-for-python) from 1.0.0b27 to 1.0.0b28.
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/main/doc/esrp_release.md)
- [Commits](Azure/azure-sdk-for-python@azure-monitor-opentelemetry-exporter_1.0.0b27...azure-monitor-opentelemetry-exporter_1.0.0b28)

---
updated-dependencies:
- dependency-name: azure-monitor-opentelemetry-exporter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

code/function/requirements.txt

@@ -7,7 +7,7 @@ azure-functions~=1.20.0
 fastapi~=0.112.1
 pydantic-settings~=2.3.4
 httpx~=0.27.0
-azure-monitor-opentelemetry-exporter==1.0.0b27
+azure-monitor-opentelemetry-exporter==1.0.0b28
 opentelemetry-instrumentation-fastapi==0.47b0
 opentelemetry-instrumentation-httpx~=0.47b0
 opentelemetry-instrumentation-system-metrics~=0.47b0