Fix argument types for Illuminate/Database/Query/Builder::upsert() (#55849)

* Fix argument types for Illuminate/Database/Query/Builder::upsert()

Ensures IDE hinting isn't out of order.

* Restore previous sorting of imports

Author: jellisii

src/Illuminate/Database/Query/Builder.php

@@ -3898,11 +3898,9 @@ public function updateOrInsert(array $attributes, array|callable $values = [])
     /**
      * Insert new records or update the existing ones.
      *
-     * @param  array|string  $uniqueBy
-     * @param  array|null  $update
      * @return int
      */
-    public function upsert(array $values, $uniqueBy, $update = null)
+    public function upsert(array $values, array|string $uniqueBy, ?array $update = null)
     {
         if (empty($values)) {
             return 0;