Fix: Use compact_nullable_type_declaration instead of deprecated compact_nullable_typehint fixer

Author: localheinz

.php-cs-fixer.dist.php

@@ -70,7 +70,7 @@
         'combine_consecutive_issets' => true,
         'combine_consecutive_unsets' => true,
         'combine_nested_dirname' => true,
-        'compact_nullable_typehint' => true,
+        'compact_nullable_type_declaration' => true,
         'concat_space' => ['spacing' => 'one'],
         'constant_case' => true,
         'control_structure_braces' => true,