Bump version to 2.31.0-SNAPSHOT (#152)

Signed-off-by: Slimane AMAR <slimane.amar_externe@rte-france.com>
Co-authored-by: Slimane AMAR <slimane.amar_externe@rte-france.com>

Author: SlimaneAmar

pom.xml

@@ -19,7 +19,7 @@
 
     <artifactId>powsybl-case-server</artifactId>
     <name>Case server</name>
-    <version>2.30.0-SNAPSHOT</version>
+    <version>2.31.0-SNAPSHOT</version>
 
     <licenses>
         <license>