Remove 3.9.x doc branch as its not LTS
diff --git a/antora-playbook-snippets/antora-playbook.yml b/antora-playbook-snippets/antora-playbook.yml
index c272537..42783d8 100644
--- a/antora-playbook-snippets/antora-playbook.yml
+++ b/antora-playbook-snippets/antora-playbook.yml
@@ -51,7 +51,6 @@
     - url: https://github.com/apache/camel-quarkus.git
       branches:
         - main
-        - 3.9.x
         - 3.8.x
         - 3.2.x
       start_path: docs