Improve RedisMutex token randomness

Author: mvorisek

src/mutex/RedisMutex.php

@@ -50,7 +50,7 @@ protected function acquire(string $key, float $expire): bool
         // 2.
         $acquired = 0;
         $errored = 0;
-        $this->token = bin2hex(random_bytes(16));
+        $this->token = bin2hex(random_bytes(16)) . md5((string) $time);
         $exception = null;
         foreach ($this->redisAPIs as $index => $redisAPI) {
             try {