chore(deps): update docker/setup-buildx-action action to v3 (#28)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) | action | major | `v2` -> `v3` |

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### Release Notes

<details>
<summary>docker/setup-buildx-action (docker/setup-buildx-action)</summary>

### [`v3`](https://github.com/docker/setup-buildx-action/compare/v2...v3)

[Compare Source](https://github.com/docker/setup-buildx-action/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:eyJjcmVhdGVkSW5WZXIiOiIzOS4yMzguMiIsInVwZGF0ZWRJblZlciI6IjM5LjIzOC4yIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-authored-by: t.behrendt <t.behrendt@noreply.localhost>
Reviewed-on: #28
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

package.json

@@ -1,9 +1,9 @@
 {
   "scripts": {
-    "build": "bun build --minify --target bun --outdir dist --sourcemap src/app.ts",
+    "build": "bun build --minify --target bun --outdir dist --sourcemap src/main.ts",
     "check:code": "eslint src/ --ext .ts",
     "check:spell": "cspell --config cspell.code.json **/*.ts",
-    "start": "bun run src/app.ts"
+    "start": "bun run src/main.ts"
   },
   "devDependencies": {
     "@types/ts3-nodejs-library": "^2.0.1",
@@ -22,6 +22,6 @@
     "ts3-nodejs-library": "^3.4.1"
   },
   "name": "ts3gotify",
-  "module": "src/app.ts",
+  "module": "src/main.ts",
   "type": "module"
 }