Merge branch 'protobuf-4.x-rc' into protobuf-4.x-test-upgrade

Author: blakeli0

release-please-config.json

@@ -1,5 +1,7 @@
 {
   "release-type": "java-yoshi-mono-repo",
+  "prerelease-type": "rc1",
+  "versioning": "prerelease",
   "separate-pull-requests": false,
   "include-component-in-tag": false,
   "group-pull-request-title-pattern": "chore(${branch}): release ${version}",
@@ -17,8 +19,9 @@
 		"hermetic_build/library_generation/owlbot/templates/java_library/.kokoro/presubmit/graalvm-native-a.cfg",
 		"hermetic_build/library_generation/owlbot/templates/java_library/.kokoro/presubmit/graalvm-native-b.cfg",
 		"hermetic_build/library_generation/owlbot/templates/java_library/.kokoro/presubmit/graalvm-native-c.cfg"
-
       ]
     }
   }
+,
+  "prerelease": true
 }