Fix CI due to upgraded linter

The formatter 'black' has a new version. Hooray.

Author: b-c-ds

regexploit/ast/categories.py

@@ -48,7 +48,7 @@ def contains(self, literal: int) -> bool:
 
 
 def list_category(category, full_unicode: bool = False):
-    if (cached := CATS.get(category)) :
+    if cached := CATS.get(category):
         yield from cached
     for data in range((sys.maxunicode + 1) if full_unicode else 256):
         c = chr(data)