build(deps-dev): bump @github/markdownlint-github from 0.8.0 to 0.8.3

Bumps [@github/markdownlint-github](https://github.com/github/markdownlint-github) from 0.8.0 to 0.8.3.
- [Release notes](https://github.com/github/markdownlint-github/releases)
- [Changelog](https://github.com/github/markdownlint-github/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/markdownlint-github/compare/v0.8.0...v0.8.3)

---
updated-dependencies:
- dependency-name: "@github/markdownlint-github"
  dependency-version: 0.8.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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