use connexion logger instead of root logger (#2010)

In `request_validation.py` and `response_validation.py` there is a call
to `logging.info()` which means the log message goes through the root
logger instead of the `connexion.middleware.validation` logger.

connexion/middleware/request_validation.py

@@ -120,7 +120,7 @@ async def __call__(self, scope: Scope, receive: Receive, send: Send):
             try:
                 body_validator = self._validator_map["body"][mime_type]  # type: ignore
             except KeyError:
-                logging.info(
+                logger.info(
                     f"Skipping validation. No validator registered for content type: "
                     f"{mime_type}."
                 )

connexion/middleware/response_validation.py

@@ -107,7 +107,7 @@ async def wrapped_send(message: t.MutableMapping[str, t.Any]) -> None:
                 try:
                     body_validator = self._validator_map["response"][mime_type]  # type: ignore
                 except KeyError:
-                    logging.info(
+                    logger.info(
                         f"Skipping validation. No validator registered for content type: "
                         f"{mime_type}."
                     )