build(deps): bump DavidAnson/markdownlint-cli2-action from 23 to 24 (#1466)

Bumps [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action) from 23 to 24.
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v23...v24)

---
updated-dependencies:
- dependency-name: DavidAnson/markdownlint-cli2-action
  dependency-version: '24'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/github-cxx-qt-tests.yml

@@ -59,7 +59,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v7
-      - uses: DavidAnson/markdownlint-cli2-action@v23
+      - uses: DavidAnson/markdownlint-cli2-action@v24
         with:
           globs: '**/*.md'