Remove commented out check->antora task dependency

Instead of having antora run always, which happens regardless of
whether anything has changed, we'll have it invoked as part of the CI
build, and we'll have to run it locally ourselves when necessary.

See gh-30481

framework-docs/framework-docs.gradle

@@ -45,12 +45,6 @@ tasks.create("generateAntoraResources") {
 	dependsOn 'generateAntoraYml'
 }
 
-// Commented out for now:
-// https://github.com/spring-projects/spring-framework/issues/30481
-// tasks.named("check") {
-//	dependsOn 'antora'
-// }
-
 jar {
 	enabled = false
 }