Bump opentelemetry-instrumentation-flask from 0.51b0 to 0.56b0

Bumps [opentelemetry-instrumentation-flask](https://github.com/open-telemetry/opentelemetry-python-contrib) from 0.51b0 to 0.56b0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-python-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-python-contrib/commits)

---
updated-dependencies:
- dependency-name: opentelemetry-instrumentation-flask
  dependency-version: 0.56b0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/backend/requirements.txt

@@ -187,7 +187,7 @@ opentelemetry-instrumentation-django==0.52b1
     # via azure-monitor-opentelemetry
 opentelemetry-instrumentation-fastapi==0.52b1
     # via azure-monitor-opentelemetry
-opentelemetry-instrumentation-flask==0.52b1
+opentelemetry-instrumentation-flask==0.56b0
     # via azure-monitor-opentelemetry
 opentelemetry-instrumentation-openai==0.41.0
     # via fastapi-app (pyproject.toml)