chore(deps): Update actions/setup-go action to v6 (#383)

This PR contains the following updates:

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

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### 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>

---

### Configuration

📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM, on day 1 of the month ( * 0-3 1 * * ) (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, 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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Author: cq-bot

.github/workflows/lint_golang.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
           cache: true

.github/workflows/unittest.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v5
       - name: Set up Go 1.x
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version-file: "go.mod"
           cache: true