chore: bump eslint-mdx from 3.1.3 to 3.1.5 (#930)

Bumps [eslint-mdx](https://github.com/mdx-js/eslint-mdx) from 3.1.3 to 3.1.5. - [Release notes](https://github.com/mdx-js/eslint-mdx/releases) - [Changelog](https://github.com/mdx-js/eslint-mdx/blob/master/CHANGELOG.md) - [Commits](https://github.com/mdx-js/eslint-mdx/compare/eslint-mdx@3.1.3...eslint-mdx@3.1.5) --- updated-dependencies: - dependency-name: eslint-mdx dependency-type: direct:development update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>