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

Author: chingor13

.github/CODEOWNERS

@@ -11,3 +11,4 @@
 /java-bigquery/ @googleapis/bigquery-team @googleapis/cloud-sdk-java-team
 /java-spanner/ @googleapis/spanner-team @googleapis/cloud-sdk-java-team
 /java-spanner-jdbc/ @googleapis/spanner-team @googleapis/cloud-sdk-java-team
+/google-auth-library-java/ @googleapis/cloud-sdk-auth-team @googleapis/cloud-sdk-java-team