Require Maven 3.6.3+

pom.xml

@@ -66,15 +66,23 @@ under the License.
   <properties>
     <recommendedJavaBuildVersion>11</recommendedJavaBuildVersion>
     <sitePluginVersion>${maven-site-plugin.version}</sitePluginVersion>
-    <mavenVersion>3.2.5</mavenVersion>
     <skipTests>false</skipTests>
   </properties>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.codehaus.plexus</groupId>
+        <artifactId>plexus-utils</artifactId>
+        <version>4.0.0</version>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <dependencies>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>
-      <version>${mavenVersion}</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
@@ -98,7 +106,6 @@ under the License.
     <dependency>
       <groupId>org.apache.maven.plugin-tools</groupId>
       <artifactId>maven-plugin-annotations</artifactId>
-      <version>3.10.2</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
@@ -109,7 +116,11 @@ under the License.
     <dependency>
       <groupId>org.codehaus.plexus</groupId>
       <artifactId>plexus-utils</artifactId>
-      <version>3.5.1</version>
+    </dependency>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-xml</artifactId>
+      <version>3.0.0</version>
     </dependency>
     <dependency>
       <groupId>edu.ucla.cs.compilers</groupId>
@@ -157,7 +168,6 @@ under the License.
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.2</version>
       <scope>test</scope>
     </dependency>
   </dependencies>