chore(deps): update pnpm to v9.15.0 (#951)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pnpm](https://pnpm.io)
([source](https://redirect.github.com/pnpm/pnpm/tree/HEAD/pnpm)) |
[`9.14.4` ->
`9.15.0`](https://renovatebot.com/diffs/npm/pnpm/9.14.4/9.15.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/pnpm/9.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/pnpm/9.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/pnpm/9.14.4/9.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/pnpm/9.14.4/9.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pnpm/pnpm (pnpm)</summary>

###
[`v9.15.0`](https://redirect.github.com/pnpm/pnpm/compare/v9.14.4...v9.15.0)

[Compare
Source](https://redirect.github.com/pnpm/pnpm/compare/v9.14.4...v9.15.0)

</details>

---

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---

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---

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package.json

@@ -4,7 +4,7 @@
   "private": true,
   "license": "MIT",
   "funding": "https://github.com/sponsors/ota-meshi",
-  "packageManager": "pnpm@9.14.4",
+  "packageManager": "pnpm@9.15.0",
   "scripts": {
     "prerelease": "cd packages/eslint-plugin-svelte && pnpm clean && pnpm run build && cd ../.. && cp README.md packages/eslint-plugin-svelte",
     "release": "changeset publish",