Require latest Maven version 3.6.3

Change-Id: Iab08ddcdb7edc3c9ac55343d3d40012e19792ea0
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.benchmarks/pom.xml

@@ -49,6 +49,26 @@
   <build>
     <sourceDirectory>src/</sourceDirectory>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>3.0.0-M3</version>
+        <executions>
+          <execution>
+            <id>enforce-maven</id>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireMavenVersion>
+                  <version>3.6.3</version>
+                </requireMavenVersion>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>

org.eclipse.jgit.packaging/pom.xml

@@ -175,7 +175,7 @@
             <configuration>
               <rules>
                 <requireMavenVersion>
-                  <version>3.5.2</version>
+                  <version>3.6.3</version>
                 </requireMavenVersion>
               </rules>
             </configuration>

pom.xml

@@ -408,7 +408,7 @@
             <configuration>
               <rules>
                 <requireMavenVersion>
-                  <version>3.6.2</version>
+                  <version>3.6.3</version>
                 </requireMavenVersion>
               </rules>
             </configuration>