fix check redis version

nexus/Database/NexusDB.php

@@ -371,13 +371,16 @@ class NexusDB
         }
     }
 
+    /**
+     * @return mixed|\Redis|null
+     */
     public static function redis()
     {
         if (IN_NEXUS) {
             global $Cache;
-            $Cache->getRedis();
+            return $Cache->getRedis();
         } else {
-            Redis::connection()->client();
+            return Redis::connection()->client();
         }
     }
 

nexus/Install/Install.php

@@ -665,8 +665,7 @@ class Install
 
     public function getRedisVersionInfo(): array
     {
-        global $Cache;
-        $redis = $Cache->getRedis();
+        $redis = NexusDB::redis();
         $result = $redis->info();
         $version = $result['redis_version'];
         $match = version_compare($version, '2.0.0', '>=');