chore: Update dependency yaml to v2.6.0 (#569)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [yaml](https://eemeli.org/yaml/)
([source](https://redirect.github.com/eemeli/yaml)) | [`2.5.1` ->
`2.6.0`](https://renovatebot.com/diffs/npm/yaml/2.5.1/2.6.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/yaml/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/yaml/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/yaml/2.5.1/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/yaml/2.5.1/2.6.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

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

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

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

</details>

---

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---

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package.json

@@ -5,7 +5,7 @@
   "devDependencies": {
     "cspell": "8.15.1",
     "markdownlint-cli": "0.41.0",
-    "yaml": "2.5.1"
+    "yaml": "2.6.0"
   },
   "scripts": {
     "check-trailing-whitespaces": "node ./scripts/check-trailing-whitespaces.js",