Use current version of python dependencies (#143)

* Use current version of python dependencies

The current versions listed in requirements.txt do not work for a recent
version of python.
Instead of pinning all those versions, we can just install the current
version of Flask

* Pin to current Flask

Author: shumphrey

election-api-python/requirements.txt

@@ -1,6 +1 @@
-click==8.0.4
-Flask==2.0.3
-itsdangerous==2.1.1
-Jinja2==3.0.3
-MarkupSafe==2.1.0
-Werkzeug==2.0.3
+Flask==3.1.2