Update actions/setup-go action to v5 (#55)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-go](https://github.com/actions/setup-go) | action | major | `v2` -> `v5` |

---

### Release Notes

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

### [`v5`](https://github.com/actions/setup-go/compare/v4...v5)

[Compare Source](https://github.com/actions/setup-go/compare/v4...v5)

### [`v4`](https://github.com/actions/setup-go/compare/v3...v4)

[Compare Source](https://github.com/actions/setup-go/compare/v3...v4)

### [`v3`](https://github.com/actions/setup-go/compare/v2...v3)

[Compare Source](https://github.com/actions/setup-go/compare/v2...v3)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), 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

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS44LjAiLCJ1cGRhdGVkSW5WZXIiOiIzOS44LjAiLCJ0YXJnZXRCcmFuY2giOiJtYXN0ZXIiLCJsYWJlbHMiOltdfQ==-->

Reviewed-on: #55
Co-authored-by: Renovate <renovate@bruyant.xyz>
Co-committed-by: Renovate <renovate@bruyant.xyz>

.gitea/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
           go-version: 1.21