Optimized the code of Hyperf\Database\Query\Grammars\Grammar::compileUpdate. (#7082)

Author: albertcht

src/Query/Grammars/PostgresGrammar.php

@@ -70,7 +70,7 @@ public function compileInsertGetId(Builder $query, $values, $sequence): string
      *
      * @param mixed $values
      */
-    public function compileUpdate(Builder $query, $values): string
+    public function compileUpdate(Builder $query, array $values): string
     {
         $table = $this->wrapTable($query->from);
 
@@ -365,10 +365,8 @@ protected function compileLock(Builder $query, $value): string
 
     /**
      * Compile the columns for an update statement.
-     *
-     * @return string
      */
-    protected function compileUpdateColumns(Builder $query, array $values)
+    protected function compileUpdateColumns(Builder $query, array $values): string
     {
         return collect($values)->map(function ($value, $key) {
             $column = last(explode('.', $key));