build: bump the all-backend-deps group in /src/backend with 3 updates

Bumps the all-backend-deps group in /src/backend with 3 updates: [semantic-kernel[azure]](https://github.com/microsoft/semantic-kernel), [openai](https://github.com/openai/openai-python) and [azure-monitor-opentelemetry](https://github.com/Azure/azure-sdk-for-python).


Updates `semantic-kernel[azure]` from 1.37.1 to 1.39.0
- [Release notes](https://github.com/microsoft/semantic-kernel/releases)
- [Commits](microsoft/semantic-kernel@python-1.37.1...dotnet-1.39.0)

Updates `openai` from 2.6.1 to 2.8.1
- [Release notes](https://github.com/openai/openai-python/releases)
- [Changelog](https://github.com/openai/openai-python/blob/main/CHANGELOG.md)
- [Commits](openai/openai-python@v2.6.1...v2.8.1)

Updates `azure-monitor-opentelemetry` from 1.8.1 to 1.8.2
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Commits](Azure/azure-sdk-for-python@azure-monitor-opentelemetry_1.8.1...azure-monitor-opentelemetry_1.8.2)

---
updated-dependencies:
- dependency-name: semantic-kernel[azure]
  dependency-version: 1.39.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-backend-deps
- dependency-name: openai
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-backend-deps
- dependency-name: azure-monitor-opentelemetry
  dependency-version: 1.8.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all-backend-deps
...

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

Author: dependabot[bot]

src/backend/requirements.txt

@@ -35,8 +35,8 @@ structlog
 typing-extensions
 python-jose[cryptography]
 passlib[bcrypt]
-semantic-kernel[azure]==1.37.1
-openai==2.6.1
+semantic-kernel[azure]==1.39.0
+openai==2.8.1
 sqlparse
 sqlglot
 unittest2
@@ -50,5 +50,5 @@ opentelemetry-sdk==1.38.0
 opentelemetry-api==1.38.0
 opentelemetry-semantic-conventions==0.59b0
 opentelemetry-instrumentation==0.59b0
-azure-monitor-opentelemetry==1.8.1
+azure-monitor-opentelemetry==1.8.2
 azure-ai-projects==1.0.0