Downgrade to aemanalyser-m-p to 1.6.4

This fixes the NPE during release described in
adobe/aemanalyser-maven-plugin#342.

Author: kwin

pom.xml

@@ -457,7 +457,8 @@
                 <plugin>
                     <groupId>com.adobe.aem</groupId>
                     <artifactId>aemanalyser-maven-plugin</artifactId>
-                    <version>1.6.10</version>
+                    <!-- moving to newer version does not work yet: https://github.com/adobe/aemanalyser-maven-plugin/issues/342 -->
+                    <version>1.6.4</version>
                     <executions>
                         <execution>
                             <id>aem-analyser</id>