test: remove auth library version from compatibility test

Author: chingor13

sdk-platform-java/dependencies.txt

@@ -10,7 +10,6 @@
 # These dependencies are declared: https://github.com/googleapis/sdk-platform-java/blob/main/gapic-generator-java-pom-parent/pom.xml
 javax.annotation:javax.annotation-api,javax.annotation-api=1.3.2
 io.grpc:grpc-bom,grpc=1.80.0
-com.google.auth:google-auth-library-bom,google.auth=1.46.0
 com.google.http-client:google-http-client,google.http-client=2.1.0
 com.google.code.gson:gson,gson=2.13.2
 com.google.guava:guava,guava=33.5.0-jre