fixup! fix(validate): add custom User-Agent for OSM/OSMCha requests

Author: susilnem

project_types/validate/api_calls.py

@@ -36,7 +36,7 @@ def retry_get(url: str, retries: int | None = 3, timeout: int | None = 10, to_os
     with requests.Session() as session:
         session.mount("https://", HTTPAdapter(max_retries=retry))
         if to_osmcha:
-            headers["Authorization"] = f"Token {Config.OSMCHA_API_KEY}"
+            headers = {"Authorization": f"Token {Config.OSMCHA_API_KEY}"}
             return session.get(url, timeout=timeout, headers=headers)
         return session.get(url, timeout=timeout, headers=headers)