fix(forwarder): fix black formatting for API key validation error message

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: LorisFriedel

aws/logs_monitoring/settings.py

@@ -243,10 +243,8 @@ def is_api_key_valid():
     # Check if the API key is the correct number of characters
     if len(DD_API_KEY) != 32:
         raise Exception(
-            f"""
-            Invalid Datadog API key format. Expected 32 characters, received {len(DD_API_KEY)}.
-            Verify your API key at https://app.{DD_SITE}/organization-settings/api-keys
-            """
+            f"Invalid Datadog API key format. Expected 32 characters, received {len(DD_API_KEY)}. "
+            f"Verify your API key at https://app.{DD_SITE}/organization-settings/api-keys"
         )
 
     # Validate the API key