chore(deps): update dependency google-cloud-vision to v2.4.1 (#204)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-vision](https://togithub.com/googleapis/python-vision) | `==2.4.0` -> `==2.4.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.1/compatibility-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-vision/2.4.1/confidence-slim/2.4.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.4.1`](https://togithub.com/googleapis/python-vision/blob/master/CHANGELOG.md#&#8203;241-httpswwwgithubcomgoogleapispython-visioncomparev240v241-2021-07-21)

[Compare Source](https://togithub.com/googleapis/python-vision/compare/v2.4.0...v2.4.1)

</details>

---

### Configuration

📅 **Schedule**: 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.

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/python-vision).

samples/snippets/crop_hints/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1
 pillow==8.3.1

samples/snippets/detect/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1
 google-cloud-storage==1.41.1

samples/snippets/document_text/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1
 pillow==8.3.1

samples/snippets/face_detection/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1
 pillow==8.3.1

samples/snippets/product_search/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1
 google-cloud-storage==1.41.1

samples/snippets/quickstart/requirements.txt

@@ -1 +1 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1

samples/snippets/web/requirements.txt

@@ -1 +1 @@
-google-cloud-vision==2.4.0
+google-cloud-vision==2.4.1