deps: update guava to 28.2-android (#389)

@codyoss

Author: elharo

pom.xml

@@ -61,7 +61,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.google.http.version>1.34.0</project.google.http.version>
     <project.junit.version>4.12</project.junit.version>
-    <project.guava.version>28.1-android</project.guava.version>
+    <project.guava.version>28.2-android</project.guava.version>
     <project.appengine.version>1.9.77</project.appengine.version>
     <project.autovalue.version>1.7</project.autovalue.version>
     <project.findbugs.version>3.0.2</project.findbugs.version>