chore: Remove hardcoded JUnit 4 version in common-protos

Author: lqiu96

java-common-protos/pom.xml

@@ -43,7 +43,6 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-iam-parent</site.installationModule>
-    <junit.version>4.13.2</junit.version>
   </properties>
 
   <dependencyManagement>