Update dependency predis/predis to v2

Author: text-html-renovate[bot]

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "ext-pcntl": "*",
         "texthtml/php-lock": "~2.1",
-        "predis/predis": "~1.0",
+        "predis/predis": "~2.0",
         "psr/log": "~1.0"
     }
 }