chore(deps): update dependency google-cloud-speech to v2.9.1 (#258)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-speech](https://github.com/googleapis/python-speech) | `==2.9.0` -> `==2.9.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.9.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.9.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.9.1/compatibility-slim/2.9.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.9.1/confidence-slim/2.9.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.9.1`](https://github.com/googleapis/python-speech/blob/master/CHANGELOG.md#&#8203;291-httpswwwgithubcomgoogleapispython-speechcomparev290v291-2021-09-24)

[Compare Source](https://github.com/googleapis/python-speech/compare/v2.9.0...v2.9.1)

</details>

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speech/microphone/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-speech==2.9.0
+google-cloud-speech==2.9.1
 pyaudio==0.2.11
 six==1.16.0
 

speech/snippets/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-speech==2.9.0
+google-cloud-speech==2.9.1
 google-cloud-storage==1.42.2