[networkx] Graph/MultiGraph inherited methods return Self (#15453)

Author: albinoyoda

stubs/networkx/networkx/classes/graph.pyi

@@ -100,8 +100,8 @@ class Graph(Collection[_Node]):
     def copy(self, as_view: bool = False) -> Self: ...
     def to_directed(self, as_view: bool = False) -> DiGraph[_Node]: ...
     def to_undirected(self, as_view: bool = False) -> Graph[_Node]: ...
-    def subgraph(self, nodes: _NBunch[_Node]) -> Graph[_Node]: ...
-    def edge_subgraph(self, edges: Iterable[_Edge[_Node]]) -> Graph[_Node]: ...
+    def subgraph(self, nodes: _NBunch[_Node]) -> Self: ...
+    def edge_subgraph(self, edges: Iterable[_Edge[_Node]]) -> Self: ...
     @overload
     def size(self, weight: None = None) -> int: ...
     @overload

stubs/networkx/networkx/classes/multigraph.pyi

@@ -52,7 +52,7 @@ class MultiGraph(Graph[_Node]):
     def get_edge_data(
         self, u: _Node, v: _Node, key: None = None, default: _DefaultT | None = None
     ) -> dict[Hashable, dict[str, Any] | _DefaultT]: ...
-    def copy(self, as_view: bool = False) -> MultiGraph[_Node]: ...
+    def copy(self, as_view: bool = False) -> Self: ...
     @cached_property
     # Including subtypes' possible return types for LSP
     def degree(self) -> MultiDegreeView[_Node] | DiMultiDegreeView[_Node]: ...