🔧 Prepare for next release

Author: github-actions[bot]

pom.xml

@@ -31,7 +31,7 @@
         <url>https://github.com/ebullient/ttrpg-convert-cli/issues</url>
     </issueManagement>
     <properties>
-        <revision>3.1.3</revision>
+        <revision>399-SNAPSHOT</revision>
         <!-- Build -->
         <clean-plugin.version>3.5.0</clean-plugin.version>
         <compiler-plugin.version>3.14.0</compiler-plugin.version>