deps: update dependency com.google.api.grpc:proto-google-cloud-bigqueryconnection-v1 to v2.15.0 (#2577)

Author: renovate-bot

pom.xml

@@ -166,7 +166,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-bigqueryconnection-v1</artifactId>
-        <version>2.14.0</version>
+        <version>2.15.0</version>
         <scope>test</scope>
       </dependency>
     </dependencies>