Update a2a/slack_researcher/slack_researcher/config.py

Co-authored-by: Alan Cha < ac3805@columbia.edu>

Co-authored-by: Alan Cha <ac3805@columbia.edu>
Signed-off-by: Mariusz Sabath <mrsabath@gmail.com>

Author: mrsabath

a2a/slack_researcher/slack_researcher/config.py

@@ -92,7 +92,7 @@ def validate_extra_headers(self) -> "Settings":
             with open(self.secret_file_path, "r") as f:
                 self.CLIENT_SECRET = f.read().strip()
         except FileNotFoundError:
-            logging.warning("CLIENT_SECRET file not found at {self.secret_file_path}")
+            logging.warning(f"CLIENT_SECRET file not found at {self.secret_file_path}")
         except Exception as e:
             logging.error(f"Error reading CLIENT_SECRET file: {e}")