Remove backward compatibility shim for ExpandableIPAddressField

Removes the deprecated ExpandableIPAddressField alias (renamed to
ExpandableIPNetworkField in a prior release) per the v4.7.0 removal schedule.

Closes #22053

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

netbox/utilities/forms/fields/expandable.py

@@ -1,5 +1,4 @@
 import re
-import warnings
 
 import netaddr
 from django import forms
@@ -71,15 +70,3 @@ class ExpandableIPNetworkField(forms.CharField):
         if family == 6 and re.search(IP6_EXPANSION_PATTERN, value):
             return list(expand_ipnetwork_pattern(value.lower(), 6))
         return [value]
-
-
-# TODO: Remove in NetBox v4.7.0
-def __getattr__(name):
-    if name == 'ExpandableIPAddressField':
-        warnings.warn(
-            "ExpandableIPAddressField has been renamed to ExpandableIPNetworkField. "
-            "ExpandableIPAddressField will be removed in NetBox v4.7.0.",
-            DeprecationWarning,
-        )
-        return ExpandableIPNetworkField
-    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")