fix tests

Author: bguerin

pipeline-maven/src/test/java/org/jenkinsci/plugins/pipeline/maven/util/MavenUtil.java

@@ -9,7 +9,7 @@
 
 public class MavenUtil {
 
-    public static final String MAVEN_VERSION = System.getProperty("maven.version", "3.8.8");
+    public static final String MAVEN_VERSION = System.getProperty("maven.version", "3.9.5");
 
     public static Maven.MavenInstallation configureDefaultMaven(FilePath agentRootPath) throws Exception {
         String mavenVersion = MAVEN_VERSION;