MINOR: Downgrade maven-surefire-plugin and maven-failsafe-plugin to 3.5.6

Author: jbonofre

pom.xml

@@ -131,6 +131,13 @@ under the License.
       We have to wait new maven-jar-plugin release, and a new Apache POM release providing it
     -->
     <version.maven-jar-plugin>3.2.2</version.maven-jar-plugin>
+    <!--
+      Downgrade maven-surefire-plugin and maven-failsafe-plugin to 3.5.6 due to
+      NullPointerException in AbstractSurefireMojo$JUnitPlatformProviderInfo.getProviderClasspath()
+      in 3.6.0 when inspected by the Develocity extension.
+    -->
+    <version.maven-surefire-plugin>3.5.6</version.maven-surefire-plugin>
+    <version.maven-failsafe-plugin>3.5.6</version.maven-failsafe-plugin>
   </properties>
 
   <dependencyManagement>