CI: Bump DavidAnson/markdownlint-cli2-action from 20 to 22

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 20 to 22.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v20...v22)

---
updated-dependencies:
- dependency-name: DavidAnson/markdownlint-cli2-action
  dependency-version: '22'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/linter.yml

@@ -56,7 +56,7 @@ jobs:
           separator: ","
       - name: Lint Markdown files
         if: steps.changed-files-md.outputs.any_changed == 'true'
-        uses: DavidAnson/markdownlint-cli2-action@v20
+        uses: DavidAnson/markdownlint-cli2-action@v22
         with:
           globs: ${{ steps.changed-files-md.outputs.all_changed_files }}
           separator: ","