Bump flask from 2.2.5 to 3.1.3 in /Human Activity Detection

Bumps [flask](https://github.com/pallets/flask) from 2.2.5 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@2.2.5...3.1.3)

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

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

Author: dependabot[bot]

Human Activity Detection/requirements.txt

@@ -1,5 +1,5 @@
 -i https://pypi.org/simple
-Flask==2.2.5
+Flask==3.1.3
 Flask-Bootstrap==3.3.7.1
 Flask-Uploads==0.2.1
 numpy==1.22.0