Fix

runner/client/src/mill/runner/client/MillProcessLauncher.java

@@ -260,7 +260,7 @@ static int getTerminalDim(String s, boolean inheritError) throws Exception {
     // Loading the native library on our own allows to speed things compared to what jansi would
     // have done on its own (reading the library in its resources and writing it in a temporary
     // location upon every new Mill run)
-    String jansiVersion = mill.runner.client.Versions.jansiVersion;
+    String jansiVersion = mill.runner.client.Versions.jansiVersion();
     File archiveCacheLocation;
     try {
       archiveCacheLocation = coursier.paths.CachePath.defaultArchiveCacheDirectory();