fix: log config file warning as string not tuple (#7918)

src/poetry/locations.py

@@ -36,13 +36,11 @@ if sys.platform == "darwin":
     if any(file.exists() for file in (auth_toml, config_toml)):
         logger.warning(
             (
-                (
                 "Configuration file exists at %s, reusing this"
                 " directory.\n\nConsider moving TOML configuration files to %s, as"
                 " support for the legacy directory will be removed in an upcoming"
                 " release."
             ),
-            ),
             _LEGACY_CONFIG_DIR,
             CONFIG_DIR,
         )