[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/DavidAnson/markdownlint-cli2: v0.19.1 → v0.20.0](DavidAnson/markdownlint-cli2@v0.19.1...v0.20.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -70,6 +70,6 @@ repos:
         entry: cmd --githook pre-commit
   # Markdownlint for linting Markdown files
   - repo: https://github.com/DavidAnson/markdownlint-cli2
-    rev: v0.19.1
+    rev: v0.20.0
     hooks:
       - id: markdownlint-cli2