chore(deps): update dependency six to v1.14.0 [(#3200)](GoogleCloudPlatform/python-docs-samples#3200)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [six](https://togithub.com/benjaminp/six) | minor | `==1.13.0` -> `==1.14.0` |

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### Release Notes

<details>
<summary>benjaminp/six</summary>

### [`v1.14.0`](https://togithub.com/benjaminp/six/blob/master/CHANGES#&#8203;1140)

[Compare Source](https://togithub.com/benjaminp/six/compare/1.13.0...1.14.0)

-   Issue [#&#8203;288](https://togithub.com/benjaminp/six/issues/288), pull request [#&#8203;289](https://togithub.com/benjaminp/six/issues/289): Add `six.assertNotRegex`.

-   Issue [#&#8203;317](https://togithub.com/benjaminp/six/issues/317): `six.moves._dummy_thread` now points to the `_thread` module on
    Python 3.9+. Python 3.7 and later requires threading and deprecated the
    `_dummy_thread` module.

-   Issue [#&#8203;308](https://togithub.com/benjaminp/six/issues/308), pull request [#&#8203;314](https://togithub.com/benjaminp/six/issues/314): Remove support for Python 2.6 and Python 3.2.

-   Issue [#&#8203;250](https://togithub.com/benjaminp/six/issues/250), issue [#&#8203;165](https://togithub.com/benjaminp/six/issues/165), pull request [#&#8203;251](https://togithub.com/benjaminp/six/issues/251): `six.wraps` now ignores missing
    attributes. This follows the Python 3.2+ standard library behavior.

</details>

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samples/microphone/requirements.txt

@@ -1,4 +1,4 @@
 google-cloud-speech==1.3.2
 pyaudio==0.2.11
-six==1.13.0
+six==1.14.0