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This PR contains the following updates:

| Package | Type | Update | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|---|---|
| [actions/checkout](https://togithub.com/actions/checkout) | action | major | `v3` -> `v4` | [![age](https://developer.mend.io/api/mc/badges/age/github-tags/actions%2fcheckout/v4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/github-tags/actions%2fcheckout/v4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/github-tags/actions%2fcheckout/v3/v4?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/github-tags/actions%2fcheckout/v3/v4?slim=true)](https://docs.renovatebot.com/merge-confidence/) |
| [google-cloud-bigquery](https://togithub.com/googleapis/python-bigquery) |  | minor | `==3.11.4` -> `==3.12.0` | [![age](https://developer.mend.io/api/mc/badges/age/pypi/google-cloud-bigquery/3.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/google-cloud-bigquery/3.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/google-cloud-bigquery/3.11.4/3.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/google-cloud-bigquery/3.11.4/3.12.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

### [`v4`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400)

[Compare Source](https://togithub.com/actions/checkout/compare/v3...v4)

-   [Support fetching without the --progress option](https://togithub.com/actions/checkout/pull/1067)
-   [Update to node20](https://togithub.com/actions/checkout/pull/1436)

</details>

<details>
<summary>googleapis/python-bigquery (google-cloud-bigquery)</summary>

### [`v3.12.0`](https://togithub.com/googleapis/python-bigquery/blob/HEAD/CHANGELOG.md#3120-2023-10-02)

[Compare Source](https://togithub.com/googleapis/python-bigquery/compare/v3.11.4...v3.12.0)

##### Features

-   Add `Dataset.storage_billing_model` setter, use `client.update_dataset(ds, fields=["storage_billing_model"])` to update ([#&#8203;1643](https://togithub.com/googleapis/python-bigquery/issues/1643)) ([5deba50](https://togithub.com/googleapis/python-bigquery/commit/5deba50b8c2d91d08bd5f5fb68742268c494b4a9))
-   Search statistics ([#&#8203;1616](https://togithub.com/googleapis/python-bigquery/issues/1616)) ([b930e46](https://togithub.com/googleapis/python-bigquery/commit/b930e4673b0d1cceb53f683e47578d87af9361f3))
-   Widen retry predicate to include ServiceUnavailable ([#&#8203;1641](https://togithub.com/googleapis/python-bigquery/issues/1641)) ([3e021a4](https://togithub.com/googleapis/python-bigquery/commit/3e021a46d387a0e3cb69913a281062fc221bb926))

##### Bug Fixes

-   Allow `storage_billing_model` to be explicitly set to `None` to use project default value ([#&#8203;1665](https://togithub.com/googleapis/python-bigquery/issues/1665)) ([514d3e1](https://togithub.com/googleapis/python-bigquery/commit/514d3e12e5131bd589dff08893fd89bf40338ba3))
-   Relax timeout expectations ([#&#8203;1645](https://togithub.com/googleapis/python-bigquery/issues/1645)) ([1760e94](https://togithub.com/googleapis/python-bigquery/commit/1760e945d16163980027fecf21113cd77ddc35a1))
-   Use isinstance() per E721, unpin flake8 ([#&#8203;1659](https://togithub.com/googleapis/python-bigquery/issues/1659)) ([54a7769](https://togithub.com/googleapis/python-bigquery/commit/54a77694afcd80be4ba469c6ebb7ca8be112b04e))

##### Documentation

-   Revise update_table_expiration sample ([#&#8203;1457](https://togithub.com/googleapis/python-bigquery/issues/1457)) ([03194e0](https://togithub.com/googleapis/python-bigquery/commit/03194e0156ed9201cb36301967c5af117d7ef29c))

</details>

---

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* fix: `docai_utilities.py` to return `Optional`

- Should resolve customer reported issue in support case #47169701 relating to duplicate/inaccurate elements in hOCR output
- Followup to:
  - #161
  - #169

* Increase test coverage

* Addressed review comments

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>