bugs: merge stable groups as first step

The is no good reason to perform it as last, but as first step it does
work better.

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

Author: arthurzam

src/pkgdev/scripts/pkgdev_bugs.py

@@ -564,9 +564,9 @@ def main(options, out: Formatter, err: Formatter):
         options.targets = list(_load_from_stdin(out, err))
     targets = list(_parse_targets(search_repo, options.targets))
     d.build_full_graph(targets)
+    d.merge_stabilization_groups()
     d.merge_cycles()
     d.merge_new_keywords_children()
-    d.merge_stabilization_groups()
 
     for node in d.nodes:
         node.cleanup_keywords(search_repo)