chore(deps): update peter-evans/create-pull-request action to v6 (#76)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[peter-evans/create-pull-request](https://togithub.com/peter-evans/create-pull-request)
| action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>peter-evans/create-pull-request
(peter-evans/create-pull-request)</summary>

###
[`v6`](https://togithub.com/peter-evans/create-pull-request/compare/v5...v6)

[Compare
Source](https://togithub.com/peter-evans/create-pull-request/compare/v5...v6)

</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

---

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.github/workflows/sync.yml

@@ -56,7 +56,7 @@ jobs:
         echo `git commit -m 'sync: generate client with ${{ steps.date.outputs.date }} spec'`
     - name: Create Pull Request
       id: cpr
-      uses: peter-evans/create-pull-request@v5
+      uses: peter-evans/create-pull-request@v6
       if: ${{ always() && steps.generate.conclusion == 'success' }}
       with:
         branch: sync/gh