Update php to v8.3 and symfony to v7.0

src/Git/CustomGit.php

@@ -6,7 +6,7 @@ use CzProject\GitPhp\Git;
 
 class CustomGit extends Git
 {
-    public function open($directory)
+    public function open($directory): CustomGitRepository
     {
         return new CustomGitRepository($directory, $this->runner);
     }