feat: add logic to set universe domain to sa jwt credentials

Author: mpeddada1

gapic-generator-java-pom-parent/pom.xml

@@ -27,7 +27,7 @@
         consistent across modules in this repository -->
     <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
     <grpc.version>1.70.0</grpc.version>
-    <google.auth.version>1.35.0</google.auth.version>
+    <google.auth.version>1.35.1-SNAPSHOT</google.auth.version>
     <google.http-client.version>1.47.0</google.http-client.version>
     <gson.version>2.12.1</gson.version>
     <guava.version>33.4.0-jre</guava.version>

gax-java/gax/src/main/java/com/google/api/gax/core/GoogleCredentialsProvider.java

@@ -88,6 +88,7 @@ public Credentials getCredentials() throws IOException {
           .setPrivateKey(serviceAccount.getPrivateKey())
           .setPrivateKeyId(serviceAccount.getPrivateKeyId())
           .setQuotaProjectId(serviceAccount.getQuotaProjectId())
+          .setUniverseDomain(serviceAccount.getUniverseDomain())
           .build();
     }