Bump flask from 2.3.3 to 3.0.0 in /src (#3515)

Bumps [flask](https://github.com/pallets/flask) from 2.3.3 to 3.0.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.3.3...3.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/requirements.txt

@@ -1,4 +1,4 @@
-flask==2.3.3
+flask==3.0.0
 flask-talisman==1.1.0
 gunicorn==21.2.0
 pytest==7.4.2