Merge pull request #47 from balena-io-examples/renovate/flask-2.x

Update dependency Flask to v2.3.3

Author: balena-renovate[bot]

requirements.txt

@@ -1,5 +1,5 @@
 click==8.0.4
-Flask==2.0.3
+Flask==2.3.3
 importlib-metadata==4.8.3
 itsdangerous==2.0.1
 Jinja2==3.1.6