chore(deps): update actions/setup-go action to v6.4.0 (#23)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/setup-go](https://github.com/actions/setup-go) | action | minor | `v6.3.0` → `v6.4.0` |

---

### Release Notes

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

### [`v6.4.0`](https://github.com/actions/setup-go/releases/tag/v6.4.0)

[Compare Source](https://github.com/actions/setup-go/compare/v6.3.0...v6.4.0)

#### What's Changed

##### Enhancement

- Add go-download-base-url input for custom Go distributions by [@&#8203;gdams](https://github.com/gdams) in [#&#8203;721](https://github.com/actions/setup-go/pull/721)

##### Dependency update

- Upgrade minimatch from 3.1.2 to 3.1.5 by [@&#8203;dependabot](https://github.com/dependabot) in [#&#8203;727](https://github.com/actions/setup-go/pull/727)

##### Documentation update

- Rearrange README.md, add advanced-usage.md by [@&#8203;priyagupta108](https://github.com/priyagupta108) in [#&#8203;724](https://github.com/actions/setup-go/pull/724)
- Fix Microsoft build of Go link by [@&#8203;gdams](https://github.com/gdams) in [#&#8203;734](https://github.com/actions/setup-go/pull/734)

#### New Contributors

- [@&#8203;gdams](https://github.com/gdams) made their first contribution in [#&#8203;721](https://github.com/actions/setup-go/pull/721)

**Full Changelog**: <https://github.com/actions/setup-go/compare/v6...v6.4.0>

</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 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

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My45OS4xIiwidXBkYXRlZEluVmVyIjoiNDMuOTkuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsidHlwZS9kZXBlbmRlbmNpZXMiXX0=-->

Reviewed-on: #23
Reviewed-by: Luke Tainton <luke@tainton.uk>
Co-authored-by: renovate[bot] <renovate-bot@git.tainton.uk>
Co-committed-by: renovate[bot] <renovate-bot@git.tainton.uk>

.gitea/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       #     no-fail: true
 
       - name: Setup Go
-        uses: actions/setup-go@v6.3.0
+        uses: actions/setup-go@v6.4.0
         with:
           go-version: "1.26"
 

.gitea/workflows/release.yml

@@ -47,7 +47,7 @@ jobs:
           ref: ${{ needs.tag.outputs.tag_name }}
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Log in to Gitea Container Registry
         uses: docker/login-action@v4
@@ -65,7 +65,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           tags: type=semver,pattern=v{{version}},value=${{ needs.tag.outputs.tag_name }}
           images: |