upgrade dependencies (#596)

Author: elharo

pom.xml

@@ -357,18 +357,13 @@
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>animal-sniffer-maven-plugin</artifactId>
-          <version>1.9</version>
+          <version>1.17</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-project-info-reports-plugin</artifactId>
           <version>2.7</version>
         </plugin>
-        <plugin>
-          <groupId>org.datanucleus</groupId>
-          <artifactId>maven-datanucleus-plugin</artifactId>
-          <version>${project.datanucleus-maven-plugin.version}</version>
-        </plugin>
       </plugins>
     </pluginManagement>
     <plugins>
@@ -550,18 +545,17 @@
     -->
     <project.http-client.version>1.28.1-SNAPSHOT</project.http-client.version><!-- {x-version-update:google-http-client-parent:current} -->
     <project.http-client-apache.version>2.0.1-SNAPSHOT</project.http-client-apache.version><!-- {x-version-update:google-http-client-apache:current} -->
-    <project.appengine.version>1.9.64</project.appengine.version>
+    <project.appengine.version>1.9.71</project.appengine.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.jsr305.version>3.0.2</project.jsr305.version>
     <project.gson.version>2.1</project.gson.version>
     <project.jackson-core-asl.version>1.9.13</project.jackson-core-asl.version>
     <project.jackson-core2.version>2.9.6</project.jackson-core2.version>
-    <project.protobuf-java.version>2.6.1</project.protobuf-java.version>
+    <project.protobuf-java.version>3.6.1</project.protobuf-java.version>
     <project.guava.version>26.0-android</project.guava.version>
     <project.xpp3.version>1.1.4c</project.xpp3.version>
-    <project.commons-logging.version>1.1.1</project.commons-logging.version>
+    <project.commons-logging.version>1.2</project.commons-logging.version>
     <project.httpclient.version>4.5.5</project.httpclient.version>
-    <project.jdo2-api.version>2.3-eb</project.jdo2-api.version>
     <project.opencensus.version>0.18.0</project.opencensus.version>
     <project.root-directory>..</project.root-directory>
   </properties>