test(deps): update dependency junit:junit to v4.13.1 (#296)

Author: renovate-bot

pom.xml

@@ -163,7 +163,7 @@
     <opencensus.version>0.24.0</opencensus.version>
     <annotations-api.version>1.3.2</annotations-api.version>
     <guava.version>29.0-android</guava.version><!-- We are currently using the *-android version to support JDK7. -->
-    <junit.version>4.13</junit.version>
+    <junit.version>4.13.1</junit.version>
     <truth.version>1.0.1</truth.version>
     <easymock.version>3.6</easymock.version>
     <findbugs.version>3.0.2</findbugs.version>