Bump flask in /End_to_end_Solutions/AOAISearchDemo/app/backend

Bumps [flask](https://github.com/pallets/flask) from 2.2.2 to 2.2.5.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.2.2...2.2.5)

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

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

Author: dependabot[bot]

End_to_end_Solutions/AOAISearchDemo/app/backend/requirements.txt

@@ -1,5 +1,5 @@
 azure-identity==1.13.0b3
-Flask==2.2.2
+Flask==2.2.5
 langchain==0.0.139
 openai==0.27.4
 azure-search-documents==11.4.0b3