refactor: don't use f-string on logging statements

The strings are now be formatted if the logging level is enabled.

playout/libretime_playout/liquidsoap/client/_client.py

@@ -57,10 +57,10 @@ class LiquidsoapClient:
         while timeout > 0:
             try:
                 version = self.version()
-                logger.info(f"found version {version}")
+                logger.info("found version %s", version)
                 return version
             except (ConnectionError, TimeoutError) as exception:
-                logger.warning(f"could not get version: {exception}")
+                logger.warning("could not get version: %s", exception)
                 timeout -= 1
                 sleep(1)