chore(deps): pre-commit.ci autoupdate

updates:
- [github.com/DavidAnson/markdownlint-cli2: v0.20.0 → v0.21.0](DavidAnson/markdownlint-cli2@v0.20.0...v0.21.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -50,7 +50,7 @@ repos:
     hooks:
       - id: script-must-have-extension
   - repo: https://github.com/DavidAnson/markdownlint-cli2
-    rev: v0.20.0 # Use the latest stable version
+    rev: v0.21.0 # Use the latest stable version
     hooks:
       - id: markdownlint-cli2
         args: ["--fix", "--config", "./scripts/.markdownlint-cli2.jsonc"] # Optional: specify a custom config file