chore(deps): update dependency google-cloud-iot to v2.1.0 (#123)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-iot](https://togithub.com/googleapis/python-iot) | `==2.0.2` -> `==2.1.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.1.0/compatibility-slim/2.0.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.1.0/confidence-slim/2.0.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.1.0`](https://togithub.com/googleapis/python-iot/blob/master/CHANGELOG.md#&#8203;210-httpswwwgithubcomgoogleapispython-iotcomparev202v210-2021-06-16)

[Compare Source](https://togithub.com/googleapis/python-iot/compare/v2.0.2...v2.1.0)

##### Features

-   add `from_service_account_info` ([af130f4](https://www.github.com/googleapis/python-iot/commit/af130f4f45356086d934569adf101bce1073971c))
-   add blunderbuss config to cloud iot label ([#&#8203;91](https://www.github.com/googleapis/python-iot/issues/91)) ([efd4d1b](https://www.github.com/googleapis/python-iot/commit/efd4d1ba2cb55e37e7b5efbd42a1bac1a10ce0d0))

##### Bug Fixes

-   **deps:** add packaging requirement ([#&#8203;112](https://www.github.com/googleapis/python-iot/issues/112)) ([7bb82a7](https://www.github.com/googleapis/python-iot/commit/7bb82a76b2ac008b3f6310bd050e10c503eb5d09))
-   use correct retry deadlines ([#&#8203;81](https://www.github.com/googleapis/python-iot/issues/81)) ([af130f4](https://www.github.com/googleapis/python-iot/commit/af130f4f45356086d934569adf101bce1073971c))

##### [2.0.2](https://www.github.com/googleapis/python-iot/compare/v2.0.1...v2.0.2) (2021-02-05)

##### Bug Fixes

-   add fieldMask for getDevice and listDevices ([#&#8203;64](https://www.github.com/googleapis/python-iot/issues/64)) ([24c9c9a](https://www.github.com/googleapis/python-iot/commit/24c9c9a98af4147c77aa632ec4a9c3fb6464f30c))

##### [2.0.1](https://www.github.com/googleapis/python-iot/compare/v2.0.0...v2.0.1) (2020-09-10)

##### Documentation

-   fix link to client library docs ([#&#8203;33](https://www.github.com/googleapis/python-iot/issues/33)) ([074cb0a](https://www.github.com/googleapis/python-iot/commit/074cb0aa5c94c53980e96d49edfa4cd8d3ee6b25))

</details>

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samples/api-client/manager/requirements.txt

@@ -3,7 +3,7 @@ flaky==3.7.0
 google-api-python-client==2.9.0
 google-auth-httplib2==0.1.0
 google-auth==1.31.0
-google-cloud-iot==2.0.2
+google-cloud-iot==2.1.0
 google-cloud-pubsub==1.7.0
 paho-mqtt==1.5.1
 pyjwt==2.1.0