Set asciidoctor revnumber to null

Closes gh-20934

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

@@ -181,6 +181,10 @@ asciidoctor {
 	}
 }
 
+asciidoctor {
+	attributes "revnumber": null
+}
+
 asciidoctorPdf {
 	configurations "asciidoctorExtensions"
 	dependsOn test
@@ -189,6 +193,10 @@ asciidoctorPdf {
 	}
 }
 
+asciidoctorPdf {
+	attributes "revnumber": null
+}
+
 task zip(type: Zip) {
 	dependsOn asciidoctor, asciidoctorPdf
 	duplicatesStrategy "fail"

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

@@ -155,6 +155,10 @@ tasks.withType(org.asciidoctor.gradle.jvm.AbstractAsciidoctorTask) {
 	}
 }
 
+asciidoctor {
+	attributes "revnumber": null
+}
+
 asciidoctor {
 	sources {
 		include "*.singleadoc"
@@ -167,12 +171,20 @@ asciidoctorPdf {
 	}
 }
 
+asciidoctorPdf {
+	attributes "revnumber": null
+}
+
 task asciidoctorMultipage(type: org.asciidoctor.gradle.jvm.AsciidoctorTask) {
 	sources {
 		include "*.adoc"
 	}
 }
 
+asciidoctorMultipage {
+	attributes "revnumber": null
+}
+
 syncDocumentationSourceForAsciidoctor {
 	dependsOn documentTestSlices
 	dependsOn documentStarters

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

@@ -86,12 +86,20 @@ asciidoctor {
 	attributes "stylesheet": "css/style.css"
 }
 
+asciidoctor {
+	attributes "revnumber": null
+}
+
 asciidoctorPdf {
 	sources {
 		include "index.adoc"
 	}
 }
 
+asciidoctorPdf {
+	attributes "revnumber": null
+}
+
 javadoc {
 	options {
 		author = true

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

@@ -63,6 +63,10 @@ asciidoctor {
 	}
 }
 
+asciidoctor {
+	attributes "revnumber": null
+}
+
 syncDocumentationSourceForAsciidoctorPdf {
 	from(documentPluginGoals) {
 		into "asciidoc/goals"
@@ -75,6 +79,10 @@ asciidoctorPdf {
 	}
 }
 
+asciidoctorPdf {
+	attributes "revnumber": null
+}
+
 javadoc {
 	options {
 		author = true