chore(deps): update actions/setup-go action to v5 (#624)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-go](https://github.com/actions/setup-go) | action | major | `v4` -> `v5` |

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### 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)

</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).
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Reviewed-on: https://gitea.com/gitea/tea/pulls/624
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: Renovate Bot <renovate-bot@gitea.com>
Co-committed-by: Renovate Bot <renovate-bot@gitea.com>

.gitea/workflows/release-nightly.yml

@@ -13,7 +13,7 @@ jobs:
           fetch-depth: 0
       - run: git fetch --force --tags
       - name: setup go
-        uses: https://github.com/actions/setup-go@v4
+        uses: https://github.com/actions/setup-go@v5
         with:
           go-version: '>=1.20.1'
       - name: import gpg

.gitea/workflows/release-tag.yml

@@ -14,7 +14,7 @@ jobs:
           fetch-depth: 0
       - run: git fetch --force --tags
       - name: setup go
-        uses: https://github.com/actions/setup-go@v4
+        uses: https://github.com/actions/setup-go@v5
         with:
           go-version: '>=1.20.1'
       - name: import gpg

.gitea/workflows/test-pr.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: setup go
-        uses: https://github.com/actions/setup-go@v4
+        uses: https://github.com/actions/setup-go@v5
         with:
           go-version: '>=1.20.1'
       - name: lint and build