Update dependency google-cloud-videointelligence to v1.15.0 [(#4041)](GoogleCloudPlatform/python-docs-samples#4041)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-videointelligence](https://togithub.com/googleapis/python-videointelligence) | minor | `==1.14.0` -> `==1.15.0` |

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### Release Notes

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

### [`v1.15.0`](https://togithub.com/googleapis/python-videointelligence/blob/master/CHANGELOG.md#&#8203;1150-httpswwwgithubcomgoogleapispython-videointelligencecomparev1140v1150-2020-06-09)

[Compare Source](https://togithub.com/googleapis/python-videointelligence/compare/v1.14.0...v1.15.0)

##### Features

-   add support for streaming automl action recognition in v1p3beta1; make 'features' a positional param for annotate_video in betas ([#&#8203;31](https://www.github.com/googleapis/python-videointelligence/issues/31)) ([586f920](https://www.github.com/googleapis/python-videointelligence/commit/586f920a1932e1a813adfed500502fba0ff5edb7)), closes [#&#8203;517](https://www.github.com/googleapis/python-videointelligence/issues/517) [#&#8203;538](https://www.github.com/googleapis/python-videointelligence/issues/538) [#&#8203;565](https://www.github.com/googleapis/python-videointelligence/issues/565) [#&#8203;576](https://www.github.com/googleapis/python-videointelligence/issues/576) [#&#8203;506](https://www.github.com/googleapis/python-videointelligence/issues/506) [#&#8203;586](https://www.github.com/googleapis/python-videointelligence/issues/586) [#&#8203;585](https://www.github.com/googleapis/python-videointelligence/issues/585)

</details>

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samples/analyze/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-videointelligence==1.14.0
+google-cloud-videointelligence==1.15.0
 google-cloud-storage==1.28.1