deps: update dependency com.google.guava:guava to v29 (#240)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| com.google.guava:guava | major | `28.2-android` -> `29.0-android` |

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pom.xml

@@ -77,7 +77,7 @@
       <dependency>
         <groupId>com.google.guava</groupId>
         <artifactId>guava</artifactId>
-        <version>28.2-android</version>
+        <version>29.0-android</version>
       </dependency>
       <dependency>
         <groupId>com.google.http-client</groupId>