chore(deps): bump DavidAnson/markdownlint-cli2-action (#100)

Bumps the actions group with 1 update: [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action).


Updates `DavidAnson/markdownlint-cli2-action` from 17 to 18
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v17...v18)

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

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

.github/workflows/markdownlint.yaml

@@ -48,7 +48,7 @@ jobs:
       - name: Checkout repo
         uses: actions/checkout@v4
       - name: Lint Markdown files
-        uses: 'DavidAnson/markdownlint-cli2-action@v17'
+        uses: 'DavidAnson/markdownlint-cli2-action@v18'
         with:
           config: ${{ inputs.config_file }}
           fix: ${{ inputs.fix }}