Update coffig to 3.1.6 snap

Author: adrienlauer

pom.xml

@@ -26,7 +26,7 @@
         <nuun-kernel.version>1.0.M11-SNAPSHOT</nuun-kernel.version>
         <javassist.version>3.24.1-GA</javassist.version>
         <shed.version>1.1.6</shed.version>
-        <coffig.version>3.1.5</coffig.version>
+        <coffig.version>3.1.6-SNAPSHOT</coffig.version>
         <commons-cli.version>1.4</commons-cli.version>
         <guice.version>4.2.3</guice.version>
         <guava.version>29.0-jre</guava.version>