chore(deps): update dependency google-cloud-vision to v2.2.0 (googleapis#109)

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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) | `==2.1.0` -> `==2.2.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.2.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.2.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.2.0/compatibility-slim/2.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.2.0/confidence-slim/2.1.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.2.0`](https://togithub.com/googleapis/python-vision/blob/master/CHANGELOG.md#&#8203;220-httpswwwgithubcomgoogleapispython-visioncomparev210v220-2021-02-11)

[Compare Source](https://togithub.com/googleapis/python-vision/compare/v2.1.0...v2.2.0)

##### Features

-   add from_service_account_info factory ([7c3035a](https://www.github.com/googleapis/python-vision/commit/7c3035a5fa58d7218ba4ee60fbd0b37fd5fb21ab))
-   **v1:** add `LEFT_CHEEK_CENTER` and `RIGHT_CHEEK_CENTER` to `FaceAnnotation` ([#&#8203;103](https://www.github.com/googleapis/python-vision/issues/103)) ([7c3035a](https://www.github.com/googleapis/python-vision/commit/7c3035a5fa58d7218ba4ee60fbd0b37fd5fb21ab))

##### Bug Fixes

-   **v1:** deprecate confidence fields in safe search annotation ([7c3035a](https://www.github.com/googleapis/python-vision/commit/7c3035a5fa58d7218ba4ee60fbd0b37fd5fb21ab))

##### Documentation

-   use absolute references for types in docstrings ([7c3035a](https://www.github.com/googleapis/python-vision/commit/7c3035a5fa58d7218ba4ee60fbd0b37fd5fb21ab))

</details>

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samples/snippets/crop_hints/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0
 pillow==8.1.0

samples/snippets/detect/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0
 google-cloud-storage==1.35.0

samples/snippets/document_text/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0
 pillow==8.1.0

samples/snippets/face_detection/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0
 pillow==8.1.0

samples/snippets/product_search/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0
 google-cloud-storage==1.35.0

samples/snippets/quickstart/requirements.txt

@@ -1 +1 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0

samples/snippets/web/requirements.txt

@@ -1 +1 @@
-google-cloud-vision==2.1.0
+google-cloud-vision==2.2.0