chore(google-auth-library-java): add code owners for google-auth-library-java

Author: chingor13

.github/CODEOWNERS

@@ -8,3 +8,4 @@
 # java-vertexai has maintainers
 /java-vertexai/   @googleapis/vertexai-team @googleapis/cloud-sdk-java-team
 /java-bigquerystorage/ @googleapis/bigquery-team @googleapis/cloud-sdk-java-team
+/google-auth-library-java/ @googleapis/cloud-sdk-auth-team @googleapis/cloud-sdk-java-team