Switch to compound Antora extensions declaration.

See https://github.com/spring-io/antora-extensions?tab=readme-ov-file#antora-extensions.

antora-playbook.yml

@@ -1,13 +1,7 @@
 antora:
   extensions:
-  - '@springio/antora-extensions/partial-build-extension'
-  - '@antora/atlas-extension'
-  - require: '@springio/antora-extensions/latest-version-extension'
-  - require: '@springio/antora-extensions/inject-collector-cache-config-extension'
-  - '@antora/collector-extension'
-  - require: '@springio/antora-extensions/root-component-extension'
+  - require: '@springio/antora-extensions'
     root_component_name: 'modulith'
-  - '@springio/antora-extensions/static-page-extension'
 site:
   title: Spring Modulith
   url: https://docs.spring.io/spring-modulith/reference