bump auth to local SNAPSHOT.

Author: rmehta19

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>1.68.1</grpc.version>
-    <google.auth.version>1.29.0</google.auth.version>
+    <google.auth.version>1.29.1-SNAPSHOT</google.auth.version>
     <google.http-client.version>1.45.0</google.http-client.version>
     <gson.version>2.11.0</gson.version>
     <guava.version>33.3.1-jre</guava.version>