chore: bump up actions/setup-go action to v6 (#14553)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-go](https://redirect.github.com/actions/setup-go) |
action | major | `v5` → `v6` |

---

### Release Notes

<details>
<summary>actions/setup-go (actions/setup-go)</summary>

### [`v6`](https://redirect.github.com/actions/setup-go/compare/v5...v6)

[Compare
Source](https://redirect.github.com/actions/setup-go/compare/v5...v6)

</details>

---

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---

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.github/workflows/build-test.yml

@@ -69,7 +69,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Setup Go (for actionlint)
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: 'stable'
       - name: Install actionlint