Bump version to 3.1.2-WHO

Author: github-actions[bot]

pom.xml

@@ -12,7 +12,7 @@
 
     <groupId>edu.stanford.protege</groupId>
     <artifactId>webprotege-backend-api</artifactId>
-    <version>3.1.1-WHO</version>
+    <version>3.1.2-WHO</version>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>