Fixing bug with config where commits are signed

Thanks to @7ochem for this!

Author: weaverryan

src/Update/RecipePatcher.php

@@ -107,6 +107,7 @@ public function generatePatch(array $originalFiles, array $newFiles): RecipePatc
 
         try {
             $this->execute('git init', $tmpPath);
+            $this->execute('git config commit.gpgsign false', $tmpPath);
             $this->execute('git config user.name "Flex Updater"', $tmpPath);
             $this->execute('git config user.email ""', $tmpPath);