Add check arg explicitly to subprocess.run

Author: mudit2812

frontend/test/pytest/python_interface/inspection/test_mlir_graph.py

@@ -23,7 +23,7 @@
 xdsl = pytest.importorskip("xdsl")
 graphviz = pytest.importorskip("graphviz")
 
-if run(["which", "dot"]).returncode != 0:
+if run(["which", "dot"], check=False).returncode != 0:
     pytest.skip(reason="Graphviz isn't installed.")