Update django to 5.1.6 (#2503)

Author: sobolevn

django-stubs/utils/ipv6.pyi

@@ -1,8 +1,9 @@
+from ipaddress import IPv6Address
 from typing import Any
 
 MAX_IPV6_ADDRESS_LENGTH: int
 
 def clean_ipv6_address(
     ip_str: Any, unpack_ipv4: bool = False, error_message: str = ..., max_length: int = 39
 ) -> str: ...
-def is_valid_ipv6_address(ip_str: str) -> bool: ...
+def is_valid_ipv6_address(ip_str: str | IPv6Address) -> bool: ...