deps: update dependency com.google.cloud:google-cloud-pubsublite-bom to v1.13.8 (#6657)

Author: renovate-bot

google-cloud-bom/pom.xml

@@ -231,7 +231,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsublite-bom</artifactId>
-        <version>1.13.7</version>
+        <version>1.13.8</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>