Bump Cobalt version

I promise! The joys of using -SNAPSHOT I guess...

This will now correctly cause orphaned threads to be cleaned up,
reducing the risk of thread saturation.

src/main/java/dan200/computercraft/core/lua/CobaltLuaMachine.java

@@ -242,7 +242,7 @@ public class CobaltLuaMachine implements ILuaMachine
                         }
                         catch( InterruptedException e )
                         {
-                            throw new OrphanedThread();
+                            throw new InterruptedError( e );
                         }
                         catch( LuaException e )
                         {