chore(deps): update dependency google-cloud-automl to v2.4.0 (#185)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-automl](https://togithub.com/googleapis/python-automl) | `==2.3.0` -> `==2.4.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-automl/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-automl/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-automl/2.4.0/compatibility-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-automl/2.4.0/confidence-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-automl</summary>

### [`v2.4.0`](https://togithub.com/googleapis/python-automl/blob/master/CHANGELOG.md#&#8203;240-httpswwwgithubcomgoogleapispython-automlcomparev230v240-2021-07-12)

[Compare Source](https://togithub.com/googleapis/python-automl/compare/v2.3.0...v2.4.0)

##### Features

-   add always_use_jwt_access ([#&#8203;175](https://www.github.com/googleapis/python-automl/issues/175)) ([7da3fc7](https://www.github.com/googleapis/python-automl/commit/7da3fc7b4a8e648afad733cb2ee4e1dbe74fb736))
-   support self-signed JWT flow for service accounts ([bfece77](https://www.github.com/googleapis/python-automl/commit/bfece7799fe6cf803d650c26e0d6e2a78e64f7c1))

##### Bug Fixes

-   add async client to %name\_%version/init.py ([bfece77](https://www.github.com/googleapis/python-automl/commit/bfece7799fe6cf803d650c26e0d6e2a78e64f7c1))
-   **deps:** add packaging requirement ([#&#8203;162](https://www.github.com/googleapis/python-automl/issues/162)) ([dea0cc3](https://www.github.com/googleapis/python-automl/commit/dea0cc37794c57a4b0521c039dc251becf694021))
-   disable always_use_jwt_access ([160a7ad](https://www.github.com/googleapis/python-automl/commit/160a7adad3f2d53ca6f733a21e72bfe866a5ebc1))
-   disable always_use_jwt_access ([#&#8203;181](https://www.github.com/googleapis/python-automl/issues/181)) ([160a7ad](https://www.github.com/googleapis/python-automl/commit/160a7adad3f2d53ca6f733a21e72bfe866a5ebc1))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-automl/issues/1127)) ([#&#8203;172](https://www.github.com/googleapis/python-automl/issues/172)) ([2489e39](https://www.github.com/googleapis/python-automl/commit/2489e397c1fc66d5dc360f150935673a25537c02)), closes [#&#8203;1126](https://www.github.com/googleapis/python-automl/issues/1126)

</details>

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packages/google-cloud-automl/samples/beta/requirements.txt

@@ -1 +1 @@
-google-cloud-automl==2.3.0
+google-cloud-automl==2.4.0

packages/google-cloud-automl/samples/snippets/requirements.txt

@@ -1,3 +1,3 @@
 google-cloud-translate==3.2.1
 google-cloud-storage==1.40.0
-google-cloud-automl==2.3.0
+google-cloud-automl==2.4.0

packages/google-cloud-automl/samples/tables/requirements.txt

@@ -1 +1 @@
-google-cloud-automl==2.3.0
+google-cloud-automl==2.4.0