Remove missing uri default

Author: JBorrow

soauth/config/settings.py

@@ -44,7 +44,7 @@ class Settings(BaseSettings):
 
     github_client_id: str | None = None
     github_client_secret: str | None = None
-    github_redirect_uri: str | None
+    github_redirect_uri: str | None = None
     github_organization_checks: list[str] = []
 
     # Production setup