pass module spec via stdin instead of command line args. Fixes #4717

Author: apollo13

src/ansiblelint/rules/args.py

@@ -194,11 +194,8 @@ def matchtask(
                     # through `ArgumentSpecValidator` class as in case of modules.
                     return []
 
-                with patch.object(
-                    sys,
-                    "argv",
-                    ["", json.dumps({"ANSIBLE_MODULE_ARGS": clean_json(module_args)})],
-                ):
+                buffer = io.BytesIO(json.dumps({"ANSIBLE_MODULE_ARGS": clean_json(module_args)}).encode())
+                with patch.object(sys, "stdin", io.TextIOWrapper(buffer)), patch.object(sys, "argv", [""]):
                     fio = io.StringIO()
                     failed_msg = ""
                     # Warning: avoid running anything while stdout is redirected