deps: update core dependencies to v29 (#84)

Author: renovate-bot

pom.xml

@@ -65,7 +65,7 @@
     <google.core.version>1.93.4</google.core.version>
     <gax.version>1.56.0</gax.version>
     <http-client-bom.version>1.34.2</http-client-bom.version>
-    <guava.version>28.2-android</guava.version>
+    <guava.version>29.0-android</guava.version>
     <junit.version>4.12</junit.version>
     <google.common-protos.version>1.17.0</google.common-protos.version>
     <protobuf.version>3.11.4</protobuf.version>