Fix some IDE warnings, mostly around type safety on the Python side

alertproviders/ng3k.py

@@ -1,8 +1,10 @@
 import re
 from datetime import datetime
+from typing import cast
 
 import pytz
 from rss_parser import Parser
+from rss_parser.models.rss import RSS
 
 from alertproviders.http_alert_provider import HTTPAlertProvider
 from data.alert import Alert
@@ -20,7 +22,7 @@ class NG3K(HTTPAlertProvider):
 
     def _http_response_to_alerts(self, http_response):
         new_alerts = []
-        rss = Parser.parse(http_response.content.decode())
+        rss = cast(RSS, Parser.parse(http_response.content.decode()))
         # Iterate through source data
         for source_alert in rss.channel.items:
             # Deal with "the format"...