context: Use normal type hint rather than forward reference

SNode is imported and available so there's no need to use the "libyang.SNode"
forward reference form. (based)pyright complains about this as it considers
these forward references as `Unknown` -- perhaps it should be smarter, but
that's a different issue.

Signed-off-by: Christian Hopps <chopps@labn.net>

Author: choppsv1

libyang/context.py

@@ -371,7 +371,7 @@ def find_path(
         self,
         path: str,
         output: bool = False,
-        root_node: Optional["libyang.SNode"] = None,
+        root_node: Optional[SNode] = None,
     ) -> Iterator[SNode]:
         if self.cdata is None:
             raise RuntimeError("context already destroyed")
@@ -404,9 +404,9 @@ def find_path(
     def find_jsonpath(
         self,
         path: str,
-        root_node: Optional["libyang.SNode"] = None,
+        root_node: Optional[SNode] = None,
         output: bool = False,
-    ) -> Optional["libyang.SNode"]:
+    ) -> Optional[SNode]:
         if root_node is not None:
             ctx_node = root_node.cdata
         else: