Fix configuration_url for Shelly device using IPv6 (#121939)

Co-authored-by: Maciej Bieniek <478555+bieniu@users.noreply.github.com>

homeassistant/components/shelly/utils.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 from datetime import datetime, timedelta
-from ipaddress import IPv4Address
+from ipaddress import IPv4Address, IPv6Address, ip_address
 import re
 from types import MappingProxyType
 from typing import Any, cast
@@ -486,6 +486,20 @@ def get_http_port(data: MappingProxyType[str, Any]) -> int:
     return cast(int, data.get(CONF_PORT, DEFAULT_HTTP_PORT))
 
 
+def get_host(host: str) -> str:
+    """Get the device IP address or hostname."""
+    try:
+        ip_object = ip_address(host)
+    except ValueError:
+        # host contains hostname
+        return host
+
+    if isinstance(ip_object, IPv6Address):
+        return f"[{host}]"
+
+    return host
+
+
 @callback
 def async_remove_shelly_rpc_entities(
     hass: HomeAssistant, domain: str, mac: str, keys: list[str]