chore(deps): update dependency google-cloud-iot to v0.3.1 (#3159)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [google-cloud-iot](https://togithub.com/googleapis/python-iot) | patch | `==0.3.0` -> `==0.3.1` |

---

### Release Notes

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

### [`v0.3.1`](https://togithub.com/googleapis/python-iot/blob/master/CHANGELOG.md#&#8203;100httpswwwgithubcomgoogleapispython-iotcomparev031v100-2020-02-28)

[Compare Source](https://togithub.com/googleapis/python-iot/compare/v0.3.0...v0.3.1)

##### Features

-   bump release status to GA ([#&#8203;6](https://www.github.com/googleapis/python-iot/issues/6)) ([6793d49](https://www.github.com/googleapis/python-iot/commit/6793d493ec576191996c2e82c52ff549ee26347c))

##### [0.3.1](https://www.github.com/googleapis/python-iot/compare/v0.3.0...v0.3.1) (2020-02-06)

##### Bug Fixes

-   **iot:** modify retry and timeout configs; add 2.7 deprecation warning; add 'required' to docstring for required args; add 3.8 unit tests (via synth)  ([#&#8203;10069](https://www.github.com/googleapis/python-iot/issues/10069)) ([ce6f5cf](https://www.github.com/googleapis/python-iot/commit/ce6f5cf2c1611af179da8dba3f73b1f8dc1bb1e1))

</details>

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iot/api-client/gcs_file_to_device/requirements.txt

@@ -1,7 +1,7 @@
 google-api-python-client==1.7.11
 google-auth==1.11.2
 google-auth-httplib2==0.0.3
-google-cloud-iot==0.3.0
+google-cloud-iot==0.3.1
 google-cloud-pubsub==1.0.0
 google-cloud-storage==1.26.0
 cryptography==2.8

iot/api-client/http_example/requirements.txt

@@ -2,7 +2,7 @@ cryptography==2.8
 google-api-python-client==1.7.11
 google-auth-httplib2==0.0.3
 google-auth==1.11.2
-google-cloud-iot==0.3.0
+google-cloud-iot==0.3.1
 google-cloud-pubsub==1.1.0
 pyjwt==1.7.1
 requests==2.22.0

iot/api-client/manager/requirements.txt

@@ -3,7 +3,7 @@ flaky==3.6.1
 google-api-python-client==1.7.11
 google-auth-httplib2==0.0.3
 google-auth==1.11.2
-google-cloud-iot==0.3.0
+google-cloud-iot==0.3.1
 google-cloud-pubsub==1.1.0
 oauth2client==4.1.3
 paho-mqtt==1.5.0

iot/api-client/mqtt_example/requirements.txt

@@ -5,7 +5,7 @@ google-api-python-client==1.7.11
 google-auth-httplib2==0.0.3
 google-auth==1.11.2
 google-cloud-pubsub==1.0.0
-google-cloud-iot==0.3.0
+google-cloud-iot==0.3.1
 grpc-google-iam-v1==0.12.3
 pyjwt==1.7.1
 paho-mqtt==1.4.0