Add JVM options to prevent warnings with asciidoctor

See gh-32123

spring-boot-project/spring-boot-actuator-autoconfigure/build.gradle

@@ -222,12 +222,18 @@ asciidoctor {
 	sources {
 		include "index.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 task asciidoctorPdf(type: org.asciidoctor.gradle.jvm.AsciidoctorTask) {
 	sources {
 		include "index.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 task zip(type: Zip) {

spring-boot-project/spring-boot-docs/build.gradle

@@ -332,18 +332,27 @@ asciidoctor {
 	sources {
 		include "*.singleadoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 task asciidoctorPdf(type: org.asciidoctor.gradle.jvm.AsciidoctorTask) {
 	sources {
 		include "*.singleadoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 task asciidoctorMultipage(type: org.asciidoctor.gradle.jvm.AsciidoctorTask) {
 	sources {
 		include "*.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 syncDocumentationSourceForAsciidoctor {

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/build.gradle

@@ -79,12 +79,18 @@ asciidoctor {
 	sources {
 		include "index.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 task asciidoctorPdf(type: org.asciidoctor.gradle.jvm.AsciidoctorTask) {
 	sources {
 		include "index.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 javadoc {

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/build.gradle

@@ -94,12 +94,18 @@ asciidoctor {
 	sources {
 		include "index.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 task asciidoctorPdf(type: org.asciidoctor.gradle.jvm.AsciidoctorTask) {
 	sources {
 		include "index.adoc"
 	}
+	forkOptions {
+		jvmArgs "--add-opens", "java.base/sun.nio.ch=ALL-UNNAMED", "--add-opens", "java.base/java.io=ALL-UNNAMED"
+	}
 }
 
 syncDocumentationSourceForAsciidoctorPdf {