Merge pull request #1117 from kubernetes-client/dependabot/maven/com.google.protobuf-protobuf-java-3.12.4

Bump protobuf-java from 3.12.2 to 3.12.4

Author: k8s-ci-robot

pom.xml

@@ -38,7 +38,7 @@
     <snakeyaml.version>1.26</snakeyaml.version>
     <slf4j.version>1.7.30</slf4j.version>
     <guava.version>29.0-jre</guava.version>
-    <protobuf.version>3.12.2</protobuf.version>
+    <protobuf.version>3.12.4</protobuf.version>
     <junit.version>4.12</junit.version>
     <bucket4j.version>4.10.0</bucket4j.version>
     <bouncycastle.version>1.66</bouncycastle.version>