[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/executablebooks/mdformat: 0.7.21 → 0.7.22](hukkin/mdformat@0.7.21...0.7.22)

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ repos:
     #   hooks:
     #   - id: markdownlint-fix
     - repo: https://github.com/executablebooks/mdformat
-      rev: 0.7.21  # Use the ref you want to point at
+      rev: 0.7.22  # Use the ref you want to point at
       hooks:
       - id: mdformat
         # Optionally add plugins