deps: update dependency com.google.guava:guava-bom to v28.2-android

Author: renovate-bot

pom.xml

@@ -71,7 +71,7 @@
     <protobuf.version>3.11.1</protobuf.version>
     <junit.version>4.12</junit.version>
     <easymock.version>3.6</easymock.version>
-    <guava.version>28.1-android</guava.version>
+    <guava.version>28.2-android</guava.version>
     <threeten.version>1.4.0</threeten.version>
     <javax.annotations.version>1.3.2</javax.annotations.version>
     <errorprone.version>2.3.4</errorprone.version>