fix: (branch 2.59.x)empty changes in README.md to trigger a test release (#3980)

This README.md change is not actually a fix. I'm using "fix:" to create a Release Please pull request in 2.59.x branch.

Author: suztomo

gax-java/README.md

@@ -18,13 +18,6 @@ a high risk of diamond dependency problems, because google-cloud-java uses beta
 library which can change in breaking ways between versions. See [VERSIONING](#versioning) for
 more information.
 
-> For new and existing Developers/ Contributors:
-> 
-> In December 2022, gax-java's build tool has been migrated from gradle to maven. 
-> Gradle related files are no longer being maintained and will be eventually removed.
-> 
-> The artifact coordinates in Maven Central (`{{ group_id }}:{{ artifact_id }}`) remain the same.
-
 Quickstart
 ----------