[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/igorshubovych/markdownlint-cli: v0.27.1 → v0.28.1](igorshubovych/markdownlint-cli@v0.27.1...v0.28.1)
- [github.com/pre-commit/mirrors-prettier: v2.3.2 → v2.4.1](pre-commit/mirrors-prettier@v2.3.2...v2.4.1)
- [github.com/psf/black: 21.6b0 → 21.9b0](psf/black@21.6b0...21.9b0)

.pre-commit-config.yaml

@@ -16,19 +16,19 @@ repos:
       hooks:
           - id: dockerfilelint
     - repo: https://github.com/igorshubovych/markdownlint-cli
-      rev: v0.27.1
+      rev: v0.28.1
       hooks:
           - id: markdownlint
     - repo: https://github.com/pre-commit/mirrors-prettier
-      rev: v2.3.2
+      rev: v2.4.1
       hooks:
           - id: prettier
             args:
                 - --config-precedence=file-override
             additional_dependencies:
                 - [email protected]
     - repo: https://github.com/psf/black
-      rev: 21.6b0
+      rev: 21.9b0
       hooks:
           - id: black
             language_version: python3.8