build: bump flask from 3.0.0 to 3.1.0 in /ResearchAssistant/App

Bumps [flask](https://github.com/pallets/flask) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.0.0...3.1.0)

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

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

Author: dependabot[bot]

ResearchAssistant/App/requirements.txt

@@ -1,5 +1,5 @@
 azure-identity==1.19.0
-Flask==3.0.0
+Flask==3.1.0
 openai==1.58.1
 azure-search-documents==11.4.0b6
 azure-storage-blob==12.17.0