chore(deps): update peter-evans/create-pull-request action to v8 (#2572)

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` |

---

### 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>

---

### Configuration

📅 **Schedule**: Branch creation - "after 2am every weekday,before 5am
every weekday" in timezone America/Los_Angeles, Automerge - At any time
(no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **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/mirror.yaml

@@ -16,6 +16,6 @@ jobs:
                   ./npm/private/versions_mirror.sh
                   npx @bazel/buildifier npm/private/versions.bzl
             - name: Create Pull Request
-              uses: peter-evans/create-pull-request@v7
+              uses: peter-evans/create-pull-request@v8
               with:
                   commit-message: 'chore: mirror external releases'