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

Author: renovate-bot

pom.xml

@@ -160,7 +160,7 @@
         <google.core.version>1.92.0</google.core.version>
          <!-- make sure to update the grpc version in README -->
         <grpc.version>1.26.0</grpc.version>
-        <guava.version>28.1-android</guava.version>
+        <guava.version>28.2-android</guava.version>
         <opencensus.version>0.24.0</opencensus.version>
         <protobuf.version>3.11.1</protobuf.version>
         <threeten.version>1.4.0</threeten.version>