Bump flask from 2.2.3 to 2.2.5 in /python/be

Bumps [flask](https://github.com/pallets/flask) from 2.2.3 to 2.2.5.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.2.3...2.2.5)

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

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

python/be/requirements.txt

@@ -1,5 +1,5 @@
 gunicorn==20.1.0
-flask==2.2.3
+flask==2.2.5
 newspaper3k==0.2.8
 nltk==3.8.1
 opentelemetry-instrumentation-flask==0.36b0