chore(deps): Update peter-evans/create-pull-request action to v8 (#343)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [peter-evans/create-pull-request](https://redirect.github.com/peter-evans/create-pull-request) | action | major | `v7` -> `v8` |

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### Release Notes

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

### [`v8`](https://redirect.github.com/peter-evans/create-pull-request/compare/v7...v8)

[Compare Source](https://redirect.github.com/peter-evans/create-pull-request/compare/v7...v8)

</details>

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### Configuration

📅 **Schedule**: Branch creation - Between 12:00 AM and 03:59 AM, on day 1 of the month ( * 0-3 1 * * ) (UTC), 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.

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

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This PR has been generated by [Renovate Bot](https://redirect.github.com/renovatebot/renovate).
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Author: cq-bot

.github/workflows/gen-client.yml

@@ -35,7 +35,7 @@ jobs:
           go generate ./...
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@v8
         with:
           # required so the PR triggers workflow runs
           token: ${{ secrets.GH_CQ_BOT }}