Bump promptflow from 1.15.0 to 1.16.0

Bumps [promptflow](https://github.com/microsoft/promptflow) from 1.15.0 to 1.16.0.
- [Release notes](https://github.com/microsoft/promptflow/releases)
- [Commits](microsoft/promptflow@promptflow_1.15.0...promptflow_1.16.0)

---
updated-dependencies:
- dependency-name: promptflow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -26,7 +26,7 @@ azure-ai-documentintelligence = "^1.0.0b4"
 azure-storage-blob = "^12.23.1"
 requests = "^2.32.3"
 opencv-python-headless = "^4.10.0.84"
-promptflow = "^1.15.0"
+promptflow = "^1.16.0"
 promptflow-evals = "^0.3.2"
 langgraph = "^0.2.23"
 langchain-chroma = "^0.1.4"