Update ignoredUnusedDeclaredDependency in pom.xml

Author: diegomarquezp

google-cloud-logging/pom.xml

@@ -192,7 +192,7 @@
           <configuration>
             <ignoredUsedUndeclaredDependencies>
               <!-- This dependency is used for its native image configuration in the test scope -->
-              <ignoredUnusedDeclaredDependency>com.google.api:gax:jar</ignoredUnusedDeclaredDependency>
+              <ignoredUnusedDeclaredDependency>com.google.api:gax:jar:testlib</ignoredUnusedDeclaredDependency>
             </ignoredUsedUndeclaredDependencies>
           </configuration>
         </plugin>