build: bump flask from 3.0.3 to 3.1.0 in /App

Bumps [flask](https://github.com/pallets/flask) from 3.0.3 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@3.0.3...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]

App/requirements.txt

@@ -9,7 +9,7 @@ pandas
 python-dotenv==1.0.1
 requests
 matplotlib
-flask==3.0.3
+flask==3.1.0
 azure-mgmt-cognitiveservices
 azure-cosmos
 azure-identity