Also update antlr.

Author: aaronbembenek

pom.xml

@@ -24,7 +24,7 @@
         <dependency>
             <groupId>org.antlr</groupId>
             <artifactId>antlr4</artifactId>
-            <version>4.7</version>
+            <version>4.13.2</version>
         </dependency>
         <dependency>
             <groupId>org.pcollections</groupId>
@@ -131,4 +131,4 @@
             </plugin>
         </plugins>
     </build>
-</project>
+</project>