chore: regenerate storagetransfer client (googleapis#23350)

Generated in GitHub action: https://togithub.com/googleapis/googleapis/google-api-java-client-services/actions/workflows/codegen.yaml

Author: yoshi-code-bot

clients/google-api-services-storagetransfer/v1/2.0.0/pom.xml

@@ -92,7 +92,7 @@
             <link>http://docs.oracle.com/javase/7/docs/api</link>
             <link>https://googleapis.dev/java/google-http-client/1.45.0/</link>
             <link>https://googleapis.dev/java/google-oauth-client/1.36.0/</link>
-            <link>https://googleapis.dev/java/google-api-client/2.6.0/</link>
+            <link>https://googleapis.dev/java/google-api-client/2.7.0/</link>
           </links>
         </configuration>
       </plugin>
@@ -125,7 +125,7 @@
     <dependency>
       <groupId>com.google.api-client</groupId>
       <artifactId>google-api-client</artifactId>
-      <version>2.6.0</version>
+      <version>2.7.0</version>
     </dependency>
   </dependencies>