[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.5b1 → 21.5b2](psf/black@21.5b1...21.5b2)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,7 +1,7 @@
 exclude: '^($|.*\.bin)'
 repos:
   - repo: https://github.com/psf/black
-    rev: 21.5b1
+    rev: 21.5b2
     hooks:
       - id: black
         args: [--safe, --quiet]