Update POM to 0.6.6 common API version

This fixes a build error as old snapshots are not kept by repo.eclipse.org. We should look into more frequent releases, and using full releases rather than snapshots in the future

pom.xml

@@ -17,7 +17,7 @@
     <auto-value.version>1.8.2</auto-value.version>
     <hibernate.version>5.5.6.Final</hibernate.version>
     <org.mapstruct.version>1.4.1.Final</org.mapstruct.version>
-    <eclipse-api-version>0.6.5-SNAPSHOT</eclipse-api-version>
+    <eclipse-api-version>0.6.6-SNAPSHOT</eclipse-api-version>
   </properties>
   <repositories>
     <repository>
@@ -235,4 +235,4 @@
       </properties>
     </profile>
   </profiles>
-</project>
\ No newline at end of file
+</project>