Fix test

Author: Tinche

tests/test_mypy.yml

@@ -1474,6 +1474,7 @@
         reveal_type(A)  # N: Revealed type is "type[attr.AttrsInstance]"
 
 - case: testNothingType
+  regex: true
   main: |
     from typing import Optional
     from attrs import NOTHING, NothingType
@@ -1483,4 +1484,4 @@
 
     takes_nothing(NOTHING)
     takes_nothing(None)
-    takes_nothing(1)  # E: Argument 1 to "takes_nothing" has incompatible type "Literal[1]"; expected "Literal[_Nothing.NOTHING] | None"  [arg-type]
+    takes_nothing(1)  # E: Argument 1 to "takes_nothing" has incompatible type "Literal\[1\]"; expected "(Optional\[Literal\[_Nothing.NOTHING\]\]|Literal\[_Nothing.NOTHING\] \| None)"  \[arg-type\]