fix: make client id optional too since it can be filled in Swagger UI

Author: rubenfonseca

aws_lambda_powertools/event_handler/openapi/swagger_ui/oauth2.py

@@ -14,7 +14,7 @@ class OAuth2Config(BaseModel):
     """
 
     # The client ID for the OAuth2 application
-    clientId: str = Field(alias="client_id")
+    clientId: Optional[str] = Field(alias="client_id", default=None)
 
     # The client secret for the OAuth2 application. This is sensitive information and requires the explicit presence
     # of the POWERTOOLS_DEV environment variable.