Apply suggestions from code review

Author: GromNaN

src/Query/Builder.php

@@ -735,7 +735,6 @@ public function upsert(array $values, $uniqueBy, $update = null): int
         $this->applyBeforeQueryCallbacks();
 
         $options = $this->inheritConnectionOptions();
-        $options['upsert'] = true;
         $uniqueBy = array_fill_keys((array) $uniqueBy, 1);
 
         // If no update fields are specified, all fields are updated