chore(deps): update dependency flask to v3 [security]

Author: renovate[bot]

requirements.txt

@@ -29,4 +29,4 @@ cachetools==5.3.3
 sentry-sdk[flask]==2.49.0
 geopy==2.4.1
 PySocks==1.7.1 # httplib2 proxy fails otherwise
-flask==2.3.3
+flask==3.1.3