Make IP version dispatch compatible with Python 3.14

Some properties moved from the object to the class, see
python/cpython#120698

Change-Id: I81927998586a4338b72da7e6238cad45874d2a06

Author: spt29

packages/cmk-ec/cmk/ec/main.py

@@ -265,7 +265,7 @@ def unmap_ipv4_address(ip_address: str) -> str:
     """
     with contextlib.suppress(ValueError):  # in case address[0] is a hostname
         host = ipaddress.ip_address(ip_address)
-        if host.version == 6 and host.ipv4_mapped:
+        if isinstance(host, ipaddress.IPv6Address) and host.ipv4_mapped:
             return str(host.ipv4_mapped)
     return ip_address