Merge branch '3.4.x'

Closes gh-43785

Author: wilkinsona

buildSrc/src/main/resources/org/springframework/boot/build/antora/antora-playbook-template.yml

@@ -14,11 +14,6 @@ asciidoc:
     page-stackoverflow-url: https://stackoverflow.com/tags/spring-boot
     tabs-sync-option: '@'
   extensions:
-    - '@asciidoctor/tabs'
-    - '@springio/asciidoctor-extensions'
-    - '@springio/asciidoctor-extensions/configuration-properties-extension'
-    - '@springio/asciidoctor-extensions/javadoc-extension'
-    - '@springio/asciidoctor-extensions/section-ids-extension'
 urls:
   latest_version_segment: ''
 runtime: