Bump flask from 2.3.2 to 3.1.3 in /ui

Bumps [flask](https://github.com/pallets/flask) from 2.3.2 to 3.1.3.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.3.2...3.1.3)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ui/requirements.txt

@@ -3,7 +3,7 @@ boto3==1.26.51
 boto==2.49.0
 click==8.1.3
 Flask-OAuthlib==0.9.6
-Flask==2.3.2
+Flask==3.1.3
 furl==2.1.3
 gevent==23.9.0
 jq==1.4.0