Update suzuki-shunsuke/pinact-action action to v2 (#779)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[suzuki-shunsuke/pinact-action](https://redirect.github.com/suzuki-shunsuke/pinact-action)
| action | major | `v1.4.0` → `v2.0.0` |

---

### Release Notes

<details>
<summary>suzuki-shunsuke/pinact-action
(suzuki-shunsuke/pinact-action)</summary>

###
[`v2.0.0`](https://redirect.github.com/suzuki-shunsuke/pinact-action/releases/tag/v2.0.0)

[Compare
Source](https://redirect.github.com/suzuki-shunsuke/pinact-action/compare/v1.4.0...v2.0.0)


[Issues](https://redirect.github.com/suzuki-shunsuke/pinact-action/issues?q=is%3Aissue+is%3Aclosed+milestone%3Av2.0.0)
| [Pull
Requests](https://redirect.github.com/suzuki-shunsuke/pinact-action/pulls?q=is%3Apr+is%3Aclosed+milestone%3Av2.0.0)
|
<suzuki-shunsuke/pinact-action@v1.4.0...v2.0.0>
| [Base
revision](https://redirect.github.com/suzuki-shunsuke/pinact-action/tree/d5aadd99e211402a9fed3445dd3979083499ad49)

#### ⚠️ Breaking Changes

Node.js 24 is required.

Node.js 20 was deprecated.

<https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/>

</details>

---

### Configuration

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Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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.github/workflows/pull_request.yml

@@ -43,6 +43,6 @@ jobs:
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - name: Run pinact
-        uses: suzuki-shunsuke/pinact-action@1081f5ad49ac904b7d977784f338145150a32112 # v1.4.0
+        uses: suzuki-shunsuke/pinact-action@cf51507d80d4d6522a07348e3d58790290eaf0b6 # v2.0.0
         with:
           skip_push: "true"