chore: add release-please config for protobuf-4.x (#1703)

Author: diegomarquezp

java-storage-nio/.github/release-please.yml

@@ -6,3 +6,8 @@ branches:
     handleGHRelease: true
     releaseType: java-yoshi
     branch: java7
+  - bumpMinorPreMajor: true
+    handleGHRelease: true
+    releaseType: java-yoshi
+    branch: protobuf-4.x-rc
+    manifest: true