deps: update dependency com.google.cloud:google-cloud-pubsub-bom to v1.108.0 (#717)

Author: renovate-bot

pom.xml

@@ -472,7 +472,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsub-bom</artifactId>
-        <version>1.107.0</version>
+        <version>1.108.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>