Increase stacklevel to point at user's code (#9869)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

changelog/9869.bugfix.rst

@@ -0,0 +1,2 @@
+Increase ``stacklevel`` for the ``NODE_CTOR_FSPATH_ARG`` deprecation to point to the
+user's code, not pytest.

src/_pytest/nodes.py

@@ -111,7 +111,7 @@ def _imply_path(
             NODE_CTOR_FSPATH_ARG.format(
                 node_type_name=node_type.__name__,
             ),
-            stacklevel=3,
+            stacklevel=6,
         )
     if path is not None:
         if fspath is not None: