chore(deps): update dependency markdownlint to ^0.39.0 (#625)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [markdownlint](https://redirect.github.com/DavidAnson/markdownlint) |
[`^0.38.0` ->
`^0.39.0`](https://renovatebot.com/diffs/npm/markdownlint/0.38.0/0.39.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/markdownlint/0.39.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/markdownlint/0.38.0/0.39.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>DavidAnson/markdownlint (markdownlint)</summary>

###
[`v0.39.0`](https://redirect.github.com/DavidAnson/markdownlint/blob/HEAD/CHANGELOG.md#0390)

[Compare
Source](https://redirect.github.com/DavidAnson/markdownlint/compare/v0.38.0...v0.39.0)

- Add MD060/table-column-style
- Improve MD001/MD007/MD009/MD010/MD029/MD033/MD037/MD059
- Add support for reporting violations as severity `warning`
- Deprecate `resultVersion` and `toString` (breaking change)
- Improve type definitions
- Improve demo web page
- Update dependencies

</details>

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