Fixing env change that doesn't work on windows

Author: weaverryan

tests/Maker/FunctionalTest.php

@@ -740,7 +740,7 @@ function (string $output, string $directory) {
             // test run, the UniqueEntity would not be seen, because
             // the the validation cache was out of date. The cause
             // is currently unknown, so this workaround was added
-            ->addPostMakeCommand('APP_ENV=test php bin/console cache:clear')
+            ->addPostMakeCommand('php bin/console cache:clear --env=test')
         ];
 
         // sanity check on all the interactive questions
@@ -771,7 +771,7 @@ function (string $output, string $directory) {
             ->updateSchemaAfterCommand()
             // workaround for strange failure - see test case
             // registration_form_entity_guard_authenticate for details
-            ->addPostMakeCommand('APP_ENV=test php bin/console cache:clear')
+            ->addPostMakeCommand('php bin/console cache:clear --env=test')
         ];
 
         yield 'auth_login_form_user_entity_with_encoder_logout' => [