chore(deps): update dependency google-cloud-iot to v2.2.1 (GoogleCloudPlatform#6479)

[![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-iot](https://togithub.com/googleapis/python-iot) | `==2.2.0` -> `==2.2.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.2.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.2.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.2.1/compatibility-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-iot/2.2.1/confidence-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v2.2.1`](https://togithub.com/googleapis/python-iot/blob/master/CHANGELOG.md#&#8203;221-httpswwwgithubcomgoogleapispython-iotcomparev220v221-2021-07-26)

[Compare Source](https://togithub.com/googleapis/python-iot/compare/v2.2.0...v2.2.1)

</details>

---

### Configuration

📅 **Schedule**: At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Never, 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/GoogleCloudPlatform/python-docs-samples).

Author: renovate-bot

iot/api-client/gcs_file_to_device/requirements.txt

@@ -1,7 +1,7 @@
 google-api-python-client==2.12.0
 google-auth==1.31.0
 google-auth-httplib2==0.1.0
-google-cloud-iot==2.2.0
+google-cloud-iot==2.2.1
 google-cloud-pubsub==2.6.1
 google-cloud-storage==1.41.0
 cryptography==3.4.7

iot/api-client/http_example/requirements.txt

@@ -2,7 +2,7 @@ cryptography==3.4.7
 google-api-python-client==2.12.0
 google-auth-httplib2==0.1.0
 google-auth==1.31.0
-google-cloud-iot==2.2.0
+google-cloud-iot==2.2.1
 google-cloud-pubsub==2.6.1
 pyjwt==2.1.0
 requests==2.26.0

iot/api-client/mqtt_example/requirements.txt

@@ -3,7 +3,7 @@ google-api-python-client==2.12.0
 google-auth-httplib2==0.1.0
 google-auth==1.31.0
 google-cloud-pubsub==2.6.1
-google-cloud-iot==2.2.0
+google-cloud-iot==2.2.1
 grpc-google-iam-v1==0.12.3
 pyjwt==2.1.0
 paho-mqtt==1.5.1