Remove previously deprecated StrEnum backport (home-assistant#146477)

Author: gjohansson-ST

homeassistant/backports/enum.py

@@ -25,12 +25,6 @@ class ObsoleteImportMatch:
             constant=re.compile(r"^cached_property$"),
         ),
     ],
-    "homeassistant.backports.enum": [
-        ObsoleteImportMatch(
-            reason="We can now use the Python 3.11 provided enum.StrEnum instead",
-            constant=re.compile(r"^StrEnum$"),
-        ),
-    ],
     "homeassistant.backports.functools": [
         ObsoleteImportMatch(
             reason="replaced by propcache.api.cached_property",

pylint/plugins/hass_imports.py

@@ -2,25 +2,20 @@
 
 from __future__ import annotations
 
-from enum import StrEnum
 from functools import cached_property  # pylint: disable=hass-deprecated-import
 from types import ModuleType
 from typing import Any
 
 import pytest
 
-from homeassistant.backports import (
-    enum as backports_enum,
-    functools as backports_functools,
-)
+from homeassistant.backports import functools as backports_functools
 
 from .common import import_and_test_deprecated_alias
 
 
 @pytest.mark.parametrize(
     ("module", "replacement", "breaks_in_ha_version"),
     [
-        (backports_enum, StrEnum, "2025.5"),
         (backports_functools, cached_property, "2025.5"),
     ],
 )