chore(deps): update dependency flask to v3 (#31)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

setup.cfg

@@ -7,7 +7,7 @@ license-file = LICENSE
 python_requires = >=3.8
 packages = find:
 install_requires =
-        Flask>=2.2,<3
+        Flask>=3,<4
         Flask-APScheduler==1.13.1
         datadog==0.49.1
         gql[all]==3.5.0