build(deps): bump DavidAnson/markdownlint-cli2-action (#861)

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 13.0.0 to 15.0.0.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@ed4dec6...510b996)

---
updated-dependencies:
- dependency-name: DavidAnson/markdownlint-cli2-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/markdownlint.yml

@@ -11,6 +11,6 @@ jobs:
         uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608
 
       - name: Run markdownlint
-        uses: DavidAnson/markdownlint-cli2-action@ed4dec634fd2ef689c7061d5647371d8248064f1
+        uses: DavidAnson/markdownlint-cli2-action@510b996878fc0d1a46c8a04ec86b06dbfba09de7
         with:
           globs: "**/*.md"