deps: update auth to 1.42.0-rc1 and http-client to 2.1.0-rc1 (#4014)

Author: diegomarquezp

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

@@ -28,8 +28,8 @@
         consistent across modules in this repository -->
     <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
     <grpc.version>1.76.1</grpc.version>
-    <google.auth.version>1.40.0</google.auth.version>
-    <google.http-client.version>2.0.2</google.http-client.version>
+    <google.auth.version>1.42.0-rc1</google.auth.version>
+    <google.http-client.version>2.1.0-rc1</google.http-client.version>
     <gson.version>2.12.1</gson.version>
     <guava.version>33.5.0-jre</guava.version>
     <protobuf.version>4.33.0</protobuf.version>
@@ -216,4 +216,4 @@
       <url>https://repo1.maven.org/maven2</url>
     </repository>
   </repositories>
-</project>
+</project>