[pre-commit.ci] pre-commit autoupdate (#1487)

updates:
- [github.com/psf/black: 21.8b0 → 21.9b0](psf/black@21.8b0...21.9b0)
- [github.com/pre-commit/mirrors-prettier: v2.4.0 → v2.4.1](pre-commit/mirrors-prettier@v2.4.0...v2.4.1)

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/psf/black
-    rev: 21.8b0
+    rev: 21.9b0
     hooks:
       - id: black
         args: [--target-version=py36]
@@ -39,6 +39,6 @@ repos:
         args: [--ini, .bandit]
         exclude: ^tests/
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v2.4.0
+    rev: v2.4.1
     hooks:
       - id: prettier