Fix handling of the anything_else check, this way deals with multipro…

…cessing correctly

python/outlines_core/fsm/regex.py

@@ -87,7 +87,7 @@ def fsm_info(self):
                 {
                     k: v
                     for k, v in self.alphabet._symbol_mapping.items()
-                    if k != anything_else
+                    if not isinstance(k, _AnythingElseCls)
                 },
             )