fix(deps): Update dependency yaml to v2.6.0 (#1144)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [yaml](https://eemeli.org/yaml/) ([source](https://togithub.com/eemeli/yaml)) | dependencies | minor | [`2.5.1` -> `2.6.0`](https://renovatebot.com/diffs/npm/yaml/2.5.1/2.6.0) |

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### Release Notes

<details>
<summary>eemeli/yaml (yaml)</summary>

### [`v2.6.0`](https://togithub.com/eemeli/yaml/releases/tag/v2.6.0)

[Compare Source](https://togithub.com/eemeli/yaml/compare/v2.5.1...v2.6.0)

-   Use a proper tag for `!!merge <<` keys ([#&#8203;580](https://togithub.com/eemeli/yaml/issues/580))
-   Add `stringKeys` parse option ([#&#8203;581](https://togithub.com/eemeli/yaml/issues/581))
-   Stringify a Document as a Document ([#&#8203;576](https://togithub.com/eemeli/yaml/issues/576))
-   Add sponsorship by [Manifest](https://manifest.build/)

</details>

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