chore(deps): update googlecloudplatform/release-please-action action to v4 (#448)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[GoogleCloudPlatform/release-please-action](https://togithub.com/GoogleCloudPlatform/release-please-action)
| action | major | `v3` -> `v4` |

---

### Release Notes

<details>
<summary>GoogleCloudPlatform/release-please-action
(GoogleCloudPlatform/release-please-action)</summary>

###
[`v4`](https://togithub.com/GoogleCloudPlatform/release-please-action/compare/v3...v4)

[Compare
Source](https://togithub.com/GoogleCloudPlatform/release-please-action/compare/v3...v4)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "before 4am on Monday" (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.

---

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

---

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.github/workflows/release-please.yml

@@ -16,7 +16,7 @@ jobs:
         with:
           private-key: ${{ secrets.TOKENS_PRIVATE_KEY }}
           app-id: ${{ secrets.TOKENS_APP_ID }}
-      - uses: GoogleCloudPlatform/release-please-action@v3
+      - uses: GoogleCloudPlatform/release-please-action@v4
         id: release
         with:
           token: ${{ steps.get-token.outputs.token }}