Typeshed cherry-pick: Improve signature of overlaps in ipaddress (#7260) (#12236)

This fixes a minor regression.

Author: JukkaL

mypy/typeshed/stdlib/ipaddress.pyi

@@ -84,7 +84,7 @@ class _BaseNetwork(_IPAddressBase, Container[_A], Iterable[_A], Generic[_A]):
     def max_prefixlen(self) -> int: ...
     @property
     def num_addresses(self) -> int: ...
-    def overlaps(self, other: _BaseNetwork[_A]) -> bool: ...
+    def overlaps(self, other: _BaseNetwork[IPv4Address] | _BaseNetwork[IPv6Address]) -> bool: ...
     @property
     def prefixlen(self) -> int: ...
     if sys.version_info >= (3, 7):