chore(deps): update dependency com.google.cloud:google-cloud-pubsub to v1.139.4 (#2434)

Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsub</artifactId>
-      <version>1.139.3</version>
+      <version>1.139.4</version>
     </dependency>
     <!-- [END pubsub_install_without_bom] -->