build(deps): update pnpm to v9.15.6 (#1400)

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)) |
[`9.15.5` ->
`9.15.6`](https://renovatebot.com/diffs/npm/pnpm/9.15.5/9.15.6) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/pnpm/9.15.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/pnpm/9.15.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/pnpm/9.15.5/9.15.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/pnpm/9.15.5/9.15.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v9.15.6`](https://redirect.github.com/pnpm/pnpm/releases/tag/v9.15.6):
pnpm 9.15.6

[Compare
Source](https://redirect.github.com/pnpm/pnpm/compare/v9.15.5...v9.15.6)

#### Patch Changes

- Fix instruction for updating pnpm with corepack
[#&#8203;9101](https://redirect.github.com/pnpm/pnpm/pull/9101).
- Print pnpm's version after the execution time at the end of the
console output.
- The pnpm version specified by `packageManager` cannot start with `v`.
- Fix a bug causing catalog snapshots to be removed from the
`pnpm-lock.yaml` file when using `--fix-lockfile` and `--filter`.
[#&#8203;8639](https://redirect.github.com/pnpm/pnpm/issues/8639)
- Fix a bug causing catalog protocol dependencies to not re-resolve on a
filtered install
[#&#8203;8638](https://redirect.github.com/pnpm/pnpm/issues/8638).

</details>

---

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---

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---

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package.json

@@ -13,7 +13,7 @@
     "prettier": "^3.4.2",
     "typescript": "^5.7.2"
   },
-  "packageManager": "[email protected].5",
+  "packageManager": "[email protected].6",
   "prettier": "@inabagumi/prettier-config",
   "private": true,
   "scripts": {