Change release type from java-backport to java-yoshi

Author: diegomarquezp

.github/release-please.yml

@@ -52,6 +52,6 @@ branches:
     branch: 1.140.x
   - bumpMinorPreMajor: true
     handleGHRelease: true
-    releaseType: java-backport
+    releaseType: java-yoshi
     branch: protobuf-4.x-rc
     manifest: true