Revert some added method type hints from #21 (#24)

These methods may, in fact, also accept `string` type parameters. The cast to `array` will happen only later on in `MetaQuery::addTable()` and similar methods.

Author: mpdude

src/Helper/LastmodHelper.php

@@ -72,17 +72,17 @@ public function setResetInterval(int $resetInterval): void
         $this->resetInterval = $resetInterval;
     }
 
-    public function setEntities(array $entities): void
+    public function setEntities($entities): void
     {
         $this->entities = $entities;
     }
 
-    public function setTableIdConstants(array $tableIdConstants): void
+    public function setTableIdConstants($tableIdConstants): void
     {
         $this->tableIdConstants = $tableIdConstants;
     }
 
-    public function setTables(array $tables): void
+    public function setTables($tables): void
     {
         $this->tables = $tables;
     }