fix: explicit dict type

Author: Benjamin Krull

sw360/base.py

@@ -220,7 +220,7 @@ def _update_external_ids(self, current_data: Dict[str, Any], ext_id_name: str, e
 
         return (old_value, ext_id_data, update)
 
-    def _add_params(self, url: str, params: dict) -> str:
+    def _add_params(self, url: str, params: Dict[str, str]) -> str:
         """Add the given parameter to the given url"""
 
         query_string = urlencode(params)