rm Unsupported Branches from Antora

antora-playbook.yml

@@ -11,7 +11,7 @@ git:
 content:
   sources:
   - url: https://github.com/spring-projects/spring-security
-    branches: [main, '5.{{6..9},{1..9}+({0..9})}.x', '6.+({0..9}).x']
+    branches: [main, '6.+({3..9}).x']
     tags: ['5.{{6..9},{1..9}+({0..9})}.{0..99}?(-RC+({0..9}))', '6.+({0..9}).+({0..9})?(-{RC,M}*)','!(5.6.{0..10}*)', '!(5.7.{0..8}*)', '!(5.8.{0..3}?({-RC,-M}+({0..9})))','!(6.0.{0..3}*)','!(6.1.0*)']
     start_path: docs
 asciidoc: