chore: regenerate cloudbilling client (googleapis#26108)

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-cloudbilling/v1/2.0.0/pom.xml

@@ -90,7 +90,7 @@
           <windowtitle>Cloud Billing API ${project.version}</windowtitle>
           <links>
             <link>http://docs.oracle.com/javase/7/docs/api</link>
-            <link>https://googleapis.dev/java/google-http-client/1.46.1/</link>
+            <link>https://googleapis.dev/java/google-http-client/1.46.3/</link>
             <link>https://googleapis.dev/java/google-oauth-client/1.38.0/</link>
             <link>https://googleapis.dev/java/google-api-client/2.7.2/</link>
           </links>

clients/google-api-services-cloudbilling/v1beta/2.0.0/pom.xml

@@ -90,7 +90,7 @@
           <windowtitle>Cloud Billing API ${project.version}</windowtitle>
           <links>
             <link>http://docs.oracle.com/javase/7/docs/api</link>
-            <link>https://googleapis.dev/java/google-http-client/1.46.1/</link>
+            <link>https://googleapis.dev/java/google-http-client/1.46.3/</link>
             <link>https://googleapis.dev/java/google-oauth-client/1.38.0/</link>
             <link>https://googleapis.dev/java/google-api-client/2.7.2/</link>
           </links>