Revert "Download the playbook to build dir"

This reverts commit d8f6567c89.

See gh-30481

framework-docs/framework-docs.gradle

@@ -11,7 +11,7 @@ apply from: "${rootDir}/gradle/publications.gradle"
 
 antora {
 	version = '3.2.0-alpha.2'
-	playbook = layout.buildDirectory.file('cached-antora-playbook.yml').get().getAsFile()
+	playbook = 'cached-antora-playbook.yml'
 	playbookProvider {
 		repository = 'spring-projects/spring-framework'
 		branch = 'docs-build'
@@ -229,4 +229,4 @@ publishing {
 			artifact distZip
 		}
 	}
-}
+}