Explicitly enabled blank_line_between_import_groups rule after no_extra_blank_lines

`blank_line_between_import_groups` tends to conflict with `no_extra_blank_lines` on some environments

Author: alongosz

src/lib/PhpCsFixer/Sets/Ibexa46RuleSet.php

@@ -33,6 +33,7 @@ public function getRules(): array
                 'no_unneeded_braces' => true,
                 'blank_lines_before_namespace' => true,
                 'single_line_empty_body' => true,
+                'blank_line_between_import_groups' => true,
             ],
         );
     }