Apply shlex.quote to positional args to handle paths with spaces

Signed-off-by: Maria Teresa Ortega <teresa.ortega0903@gmail.com>

Author: teresa-ortega

src/lambkin/core/shell/proxy.py

@@ -45,7 +45,7 @@ def __call__(self, *args: Any, **kwargs: Any) -> None:
         extra = []
 
         for arg in args:
-            extra.append(str(arg))
+            extra.append(shlex.quote(str(arg)))
 
         for key, value in kwargs.items():
             flag = "--" + key.replace("_", "-")