Update dependency org.codehaus.mojo:versions-maven-plugin to v2.21.0 (#154)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

maven-plugin/pom.xml

@@ -27,7 +27,7 @@
         <dependency>
             <groupId>org.codehaus.mojo</groupId>
             <artifactId>versions-maven-plugin</artifactId>
-            <version>2.19.0</version>
+            <version>2.21.0</version>
         </dependency>
         <dependency>
             <groupId>org.apache.maven.plugin-tools</groupId>

maven-plugin/src/main/java/io/jenkins/tools/incrementals/maven/IncrementalifyMojo.java

@@ -118,7 +118,7 @@ protected boolean getAllowSnapshots() {
         ArtifactVersion gclmeNewestVersion = gclmeVersions.getNewestVersion(any, false);
         super.execute();
         project.getProperties().setProperty("dollar", "$");
-        executeMojo(plugin("org.codehaus.mojo", "versions-maven-plugin", "2.19.0"), "set",
+        executeMojo(plugin("org.codehaus.mojo", "versions-maven-plugin", "2.21.0"), "set",
             configuration(
                 element("newVersion", "${dollar}{revision}${dollar}{changelist}"),
                 element("generateBackupPoms", "false")),

maven-plugin/src/main/java/io/jenkins/tools/incrementals/maven/ReincrementalifyMojo.java

@@ -69,12 +69,12 @@ public class ReincrementalifyMojo extends AbstractMojo {
             throw new MojoFailureException("Unexpected version: " + version);
         }
         properties.setProperty("dollar", "$");
-        executeMojo(plugin("org.codehaus.mojo", "versions-maven-plugin", "2.19.0"), "set",
+        executeMojo(plugin("org.codehaus.mojo", "versions-maven-plugin", "2.21.0"), "set",
             configuration(
                 element("newVersion", "${dollar}{revision}${dollar}{changelist}"),
                 element("generateBackupPoms", "false")),
             executionEnvironment(project, mavenSession, pluginManager));
-        executeMojo(plugin("org.codehaus.mojo", "versions-maven-plugin", "2.19.0"), "set-property",
+        executeMojo(plugin("org.codehaus.mojo", "versions-maven-plugin", "2.21.0"), "set-property",
             configuration(
                 element("property", "revision"),
                 element("newVersion", m.group(1)),