chore(deps): update dependency markdownlint to ^0.40.0 (#699)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [markdownlint](https://redirect.github.com/DavidAnson/markdownlint) |
[`^0.39.0` ->
`^0.40.0`](https://renovatebot.com/diffs/npm/markdownlint/0.39.0/0.40.0)
|
![age](https://developer.mend.io/api/mc/badges/age/npm/markdownlint/0.40.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/markdownlint/0.39.0/0.40.0?slim=true)
|

---

### Release Notes

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

###
[`v0.40.0`](https://redirect.github.com/DavidAnson/markdownlint/blob/HEAD/CHANGELOG.md#0400)

[Compare
Source](https://redirect.github.com/DavidAnson/markdownlint/compare/v0.39.0...v0.40.0)

- Improve MD011/MD013/MD051/MD060
- Update dependencies

</details>

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