deps: update dependency com.google.guava:guava-bom to v28.2-android (#15)

Author: renovate-bot

pom.xml

@@ -19,7 +19,7 @@
     <truth.version>1.0</truth.version>
     <gson.version>2.8.6</gson.version>
     <logging.version>1.98.0</logging.version>
-    <guava.version>28.1-android</guava.version>
+    <guava.version>28.2-android</guava.version>
     <slf4j.version>1.7.30</slf4j.version>
     <google.auth.version>0.20.0</google.auth.version>
     <junit.version>4.13</junit.version>