fix(java): remove junit version declaration (#293)

Author: dzou

google-cloud-orgpolicy/pom.xml

@@ -71,7 +71,6 @@
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <scope>test</scope>
- <version>4.13.1</version>
  </dependency>
 
  <dependency>