chore(deps): Update peter-evans/create-pull-request action to v7 (#404)

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 | `v6` -> `v7` |

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### Release Notes

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

### [`v7`](https://togithub.com/peter-evans/create-pull-request/compare/v6...v7)

[Compare Source](https://togithub.com/peter-evans/create-pull-request/compare/v6...v7)

</details>

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### Configuration

📅 **Schedule**: Branch creation - "before 4am on the first day of the month" (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://togithub.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy40NDAuNyIsInVwZGF0ZWRJblZlciI6IjM3LjQ0MC43IiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6W119-->

.github/workflows/regen.yml

@@ -38,7 +38,7 @@ jobs:
           make clone
           make gen-proto
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v7
         with:
           # required so the PR triggers workflow runs
           token: ${{ secrets.GH_CQ_BOT }}