Remove unused reference

.github/workflows/validate_python.yml

@@ -25,7 +25,6 @@ jobs:
       - name: flake8 Lint
         uses: py-actions/flake8@v2
         with:
-          ignore: "F401"  # To do: remove for v4.4
           max-line-length: "200"
           path: "components/nspanel_ha_blueprint"
 ...

components/nspanel_ha_blueprint/__init__.py

@@ -1,7 +1,7 @@
 # __init__.py
 import esphome.codegen as cg
 import esphome.config_validation as cv
-from esphome.components.esp32 import add_idf_sdkconfig_option, get_esp32_variant
+from esphome.components.esp32 import add_idf_sdkconfig_option
 from esphome.core import CORE, coroutine_with_priority
 
 CODEOWNERS = ["@edwardtfn"]