Update Maven version requirement from 3.6.3 to 3.9.14

Author: mofterdinger

pom.xml

@@ -156,7 +156,7 @@
             <configuration>
               <rules>
                 <requireMavenVersion>
-                  <version>3.6.3</version>
+                  <version>3.9.14</version>
                 </requireMavenVersion>
                 <requireJavaVersion>
                   <version>${jdk.version}</version>