chore(deps): update dependency markdownlint-cli2 to v0.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdownlint-cli2	0.14.0 -> 0.15.0

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Release Notes

DavidAnson/markdownlint-cli2 (markdownlint-cli2)

### [`v0.15.0`](https://redirect.github.com/DavidAnson/markdownlint-cli2/blob/HEAD/CHANGELOG.md#0150) [Compare Source](https://redirect.github.com/DavidAnson/markdownlint-cli2/compare/v0.14.0...v0.15.0) - Add support for `stdin` input via `-` glob - Add output formatter based on string templates - Update dependencies (including `markdownlint`)

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