Merge pull request #6912 from pixelfed/chore/cache-config-cleanup

chore: remove unused import and fix spacing in cache config

config/cache.php

@@ -1,6 +1,5 @@
 <?php
 
-use App\Models\CustomFilter;
 use Illuminate\Support\Str;
 
 return [
@@ -142,7 +141,7 @@ return [
 
     'prefix' => env(
         'CACHE_PREFIX',
-        Str::slug(env('APP_NAME', 'laravel'), '_') . '_cache'
+        Str::slug(env('APP_NAME', 'laravel'), '_').'_cache'
     ),
 
     /*