fix: format detect_secrets.py to resolve Ruff check

Author: fgogolli

dev-tools/security/detect_secrets.py

@@ -57,7 +57,7 @@ def detect_secrets(source_dir: str = "src") -> bool:
         logger.error("Potential hardcoded secrets found:")
         for secret in found_secrets:
             # Security: Don't log the actual secret content, only the location
-            location = secret.split(':')[0] if ':' in secret else 'unknown location'
+            location = secret.split(":")[0] if ":" in secret else "unknown location"
             logger.error(f"  Secret detected at: {location}")
         return False
     else: