Use latest maven-plugin-tools

Maven Plugin Tools is a set of tools (plugin, dependencies)
to generate metadata required for the Maven plugin.
As such, we can run the latest and use Dependabot to automate
the management without issues.
We still have CI tests to validate backward compatibility

.github/dependabot.yml

@@ -18,7 +18,6 @@ updates:
     ignore:
       - dependency-name: org.jruby:jruby
       - dependency-name: org.apache.maven:*
-      - dependency-name: org.apache.maven.plugin-tools:*
       - dependency-name: org.apache.maven.doxia:*
       - dependency-name: org.codehaus.plexus:*
       - dependency-name: commons-io:commons-io

asciidoctor-maven-plugin/pom.xml

@@ -22,7 +22,7 @@
     </prerequisites>
 
     <properties>
-        <maven.plugin.plugin.version>3.8.1</maven.plugin.plugin.version>
+        <maven-plugin-tools.version>3.10.2</maven-plugin-tools.version>
         <netty.version>4.1.104.Final</netty.version>
     </properties>
 
@@ -51,7 +51,7 @@
         <dependency>
             <groupId>org.apache.maven.plugin-tools</groupId>
             <artifactId>maven-plugin-annotations</artifactId>
-            <version>${maven.plugin.plugin.version}</version>
+            <version>${maven-plugin-tools.version}</version>
             <scope>provided</scope>
         </dependency>
         <dependency>
@@ -90,7 +90,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-plugin-plugin</artifactId>
-                    <version>${maven.plugin.plugin.version}</version>
+                    <version>${maven-plugin-tools.version}</version>
                     <configuration>
                         <goalPrefix>asciidoctor</goalPrefix>
                         <skipErrorNoDescriptorsFound>true</skipErrorNoDescriptorsFound>