deps: update guava to 28.1-android (#374)

* deps: update guava to 28.1-android

* build: update animal-sniffer plugin

Author: chingor13

pom.xml

@@ -268,7 +268,7 @@
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>animal-sniffer-maven-plugin</artifactId>
-          <version>1.9</version>
+          <version>1.16</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
@@ -451,7 +451,7 @@
     <project.jackson-core2.version>2.9.6</project.jackson-core2.version>
     <project.jetty.version>6.1.26</project.jetty.version>
     <project.protobuf-java.version>2.6.1</project.protobuf-java.version>
-    <project.guava.version>26.0-android</project.guava.version>
+    <project.guava.version>28.1-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.httpclient.version>4.5.5</project.httpclient.version>