Update actions/create-github-app-token action to v3 (#291)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/create-github-app-token](https://redirect.github.com/actions/create-github-app-token)
| action | major | `v2` → `v3` |

---

### Release Notes

<details>
<summary>actions/create-github-app-token
(actions/create-github-app-token)</summary>

###
[`v3`](https://redirect.github.com/actions/create-github-app-token/compare/v2...v3)

[Compare
Source](https://redirect.github.com/actions/create-github-app-token/compare/v2...v3)

</details>

---

### Configuration

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

🚦 **Automerge**: Enabled.

♻ **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

---

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.github/workflows/autorelease.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - name: Generate token
         id: token
-        uses: actions/create-github-app-token@v2
+        uses: actions/create-github-app-token@v3
         with:
           app-id: ${{ secrets.MELLBOT_APP_ID }}
           private-key: ${{ secrets.MELLBOT_PK }}