build(deps): bump flask from 1.1.2 to 2.2.5 in /tests/testapp (#432)

* build(deps): bump flask from 1.1.2 to 2.2.5 in /tests/testapp

Bumps [flask](https://github.com/pallets/flask) from 1.1.2 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@1.1.2...2.2.5)

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

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

* update to py 3 in dockerfile

---------

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

Author: dependabot[bot]

tests/testapp/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:2.7.10
+FROM python:3.11
 
 LABEL maintainer="[email protected]"
 

tests/testapp/requirements.txt

@@ -1 +1 @@
-Flask==1.1.2
+Flask==2.2.5