chore(deps): update dependency sendgrid to v6.9.2 (GoogleCloudPlatform#7181)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [sendgrid](https://togithub.com/sendgrid/sendgrid-python) | `==6.9.1` -> `==6.9.2` | [![age](https://badges.renovateapi.com/packages/pypi/sendgrid/6.9.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/sendgrid/6.9.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/sendgrid/6.9.2/compatibility-slim/6.9.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/sendgrid/6.9.2/confidence-slim/6.9.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes


sendgrid/sendgrid-python

### [`v6.9.2`](https://togithub.com/sendgrid/sendgrid-python/blob/master/CHANGELOG.md#​2021-12-01-Version-692)

[Compare Source](https://togithub.com/sendgrid/sendgrid-python/compare/6.9.1...6.9.2)

**Library - Chore**

-   [PR #&GoogleCloudPlatform#8203;1027](https://togithub.com/sendgrid/sendgrid-python/pull/1027): migrate to GitHub Actions. Thanks to [@&GoogleCloudPlatform#8203;JenniferMah](https://togithub.com/JenniferMah)!



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appengine/standard/sendgrid/requirements.txt

@@ -1 +1 @@
-sendgrid==6.9.1
+sendgrid==6.9.2