test(pre-commit): upgrade black to 21.5b0

Author: scop

.pre-commit-config.yaml

@@ -32,7 +32,7 @@ repos:
         pass_filenames: false
 
   - repo: https://github.com/psf/black
-    rev: 21.4b1
+    rev: 21.5b0
     hooks:
       - id: black
         types: [text]