deps: Upgrade Google-Auth-Library to v1.43.0 (#4114)

Author: lqiu96

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

@@ -28,7 +28,7 @@
         consistent across modules in this repository -->
     <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
     <grpc.version>1.76.3</grpc.version>
-    <google.auth.version>1.42.1</google.auth.version>
+    <google.auth.version>1.43.0</google.auth.version>
     <google.http-client.version>2.1.0</google.http-client.version>
     <gson.version>2.12.1</gson.version>
     <guava.version>33.5.0-jre</guava.version>