Bump commons-beanutils

CVE-2019-10086
diff --git a/pom.xml b/pom.xml
index c302051..16dd6be 100644
--- a/pom.xml
+++ b/pom.xml
@@ -257,7 +257,7 @@
       <dependency>
         <groupId>commons-beanutils</groupId>
         <artifactId>commons-beanutils</artifactId>
-        <version>1.9.3</version>
+        <version>1.9.4</version>
       </dependency>
     </dependencies>
   </dependencyManagement>