chore: regenerate doubleclicksearch client (googleapis#28837)

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-doubleclicksearch/v2/2.0.0/pom.xml

@@ -89,9 +89,9 @@
           <windowtitle>Search Ads 360 API ${project.version}</windowtitle>
           <links>
             <link>http://docs.oracle.com/javase/7/docs/api</link>
-            <link>https://googleapis.dev/java/google-http-client/2.0.0/</link>
+            <link>https://googleapis.dev/java/google-http-client/1.47.1/</link>
             <link>https://googleapis.dev/java/google-oauth-client/1.39.0/</link>
-            <link>https://googleapis.dev/java/google-api-client/2.8.1/</link>
+            <link>https://googleapis.dev/java/google-api-client/2.8.0/</link>
           </links>
         </configuration>
       </plugin>
@@ -124,7 +124,7 @@
     <dependency>
       <groupId>com.google.api-client</groupId>
       <artifactId>google-api-client</artifactId>
-      <version>2.8.1</version>
+      <version>2.8.0</version>
     </dependency>
   </dependencies>