Merge pull request #1804 from google/dependabot/maven/metrics/junit-junit-4.13.1

Bump junit from 3.8.2 to 4.13.1 in /metrics

Author: eamonnmcmanus

metrics/pom.xml

@@ -51,7 +51,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>3.8.2</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>