Remove block-switch dependency

Now it is fully managed by the `spring-asciidoctor-backends`

build.gradle

@@ -419,7 +419,6 @@ task filterMetricsDocsContent(type: Copy) {
 asciidoctorPdf {
 	dependsOn prepareAsciidocBuild, filterMetricsDocsContent
 	baseDirFollowsSourceFile()
-	configurations 'asciidoctorExt'
 
 	asciidoctorj {
 		sourceDir "$buildDir/asciidoc"
@@ -597,5 +596,3 @@ publishing {
 		}
 	}
 }
-
-apply from: "${rootDir}/gradle/docs.gradle"

gradle/docs.gradle

@@ -1,16 +0,0 @@
-configurations {
-	asciidoctorExt
-}
-
-dependencies {
-	asciidoctorExt('io.spring.asciidoctor:spring-asciidoctor-extensions-block-switch:0.6.0')
-}
-
-repositories {
-	maven {
-		url "https://repo.spring.io/release"
-		mavenContent {
-			includeGroup "io.spring.asciidoctor"
-		}
-	}
-}

settings.gradle

@@ -1,5 +1,5 @@
 plugins {
-	id 'com.gradle.enterprise' version '3.16'
+	id 'com.gradle.enterprise' version '3.15'
 	id 'io.spring.ge.conventions' version '0.0.14'
 }