Bump freemarker from 2.3.30 to 2.3.31

Bumps freemarker from 2.3.30 to 2.3.31.

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -87,7 +87,7 @@
     <dependency>
       <groupId>org.freemarker</groupId>
       <artifactId>freemarker</artifactId>
-      <version>2.3.30</version>
+      <version>2.3.31</version>
     </dependency>
     <dependency>
       <groupId>org.apache.commons</groupId>