build(deps): update pnpm to v10.21.0 (#1516)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [pnpm](https://pnpm.io)
([source](https://redirect.github.com/pnpm/pnpm/tree/HEAD/pnpm)) |
[`10.20.0` ->
`10.21.0`](https://renovatebot.com/diffs/npm/pnpm/10.20.0/10.21.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/pnpm/10.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/pnpm/10.20.0/10.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v10.21.0`](https://redirect.github.com/pnpm/pnpm/compare/v10.20.0...v10.21.0)

[Compare
Source](https://redirect.github.com/pnpm/pnpm/compare/v10.20.0...v10.21.0)

</details>

---

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---

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package.json

@@ -13,7 +13,7 @@
     "prettier": "^3.4.2",
     "typescript": "^5.7.2"
   },
-  "packageManager": "pnpm@10.20.0",
+  "packageManager": "pnpm@10.21.0",
   "prettier": "@inabagumi/prettier-config",
   "private": true,
   "scripts": {