chore(deps): update dependency google-cloud-vision to v2.4.2 (GoogleCloudPlatform#6498)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-vision](https://togithub.com/googleapis/python-vision) | `==2.4.1` -> `==2.4.2` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.2/compatibility-slim/2.4.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.2/confidence-slim/2.4.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.2`](https://togithub.com/googleapis/python-vision/blob/master/CHANGELOG.md#&#8203;242-httpswwwgithubcomgoogleapispython-visioncomparev241v242-2021-07-29)

[Compare Source](https://togithub.com/googleapis/python-vision/compare/v2.4.1...v2.4.2)

</details>

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codelabs/flex_and_vision/requirements.txt

@@ -1,6 +1,6 @@
 Flask==2.0.1
 gunicorn==20.0.4; python_version > '3.0'
 gunicorn==19.10.0; python_version < '3.0'
-google-cloud-vision==2.4.1
+google-cloud-vision==2.4.2
 google-cloud-storage==1.41.0
 google-cloud-datastore==2.1.6

functions/imagemagick/requirements.txt

@@ -1,3 +1,3 @@
-google-cloud-vision==2.4.1
+google-cloud-vision==2.4.2
 google-cloud-storage==1.41.0
 Wand==0.6.6

functions/ocr/app/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-pubsub==2.7.0
 google-cloud-storage==1.41.0
 google-cloud-translate==3.3.2
-google-cloud-vision==2.4.1
+google-cloud-vision==2.4.2

run/image-processing/requirements.txt

@@ -2,6 +2,6 @@ Flask==2.0.1
 pytest==5.3.0; python_version > "3.0"
 pytest==4.6.6; python_version < "3.0"
 gunicorn==20.1.0
-google-cloud-vision==2.4.1
+google-cloud-vision==2.4.2
 google-cloud-storage==1.41.0
 Wand==0.6.6