Fix warnings and other type checking issues

.vscode/launch.json

@@ -1,7 +1,4 @@
 {
-  // Use IntelliSense to learn about possible attributes.
-  // Hover to view descriptions of existing attributes.
-  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
     {
@@ -9,7 +6,10 @@
       "type": "debugpy",
       "request": "launch",
       "module": "uvicorn",
-      "args": ["discord_rss_bot.main:app", "--reload"],
+      "args": [
+        "discord_rss_bot.main:app",
+        "--reload"
+      ],
       "jinja": true,
       "justMyCode": true
     }