chore(deps): update dependency google-cloud-bigquery-reservation to v1.2.0 (#127)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-bigquery-reservation](https://togithub.com/googleapis/python-bigquery-reservation) | `==1.1.0` -> `==1.2.0` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-reservation/1.2.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-reservation/1.2.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-reservation/1.2.0/compatibility-slim/1.1.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-bigquery-reservation/1.2.0/confidence-slim/1.1.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/python-bigquery-reservation</summary>

### [`v1.2.0`](https://togithub.com/googleapis/python-bigquery-reservation/blob/master/CHANGELOG.md#&#8203;120-httpswwwgithubcomgoogleapispython-bigquery-reservationcomparev110v120-2021-06-30)

[Compare Source](https://togithub.com/googleapis/python-bigquery-reservation/compare/v1.1.0...v1.2.0)

##### Features

-   add always_use_jwt_access ([#&#8203;123](https://www.github.com/googleapis/python-bigquery-reservation/issues/123)) ([3123e99](https://www.github.com/googleapis/python-bigquery-reservation/commit/3123e99e8e288dcfb3627f77610c90060654bee4))
-   support self-signed JWT flow for service accounts ([4d52ed9](https://www.github.com/googleapis/python-bigquery-reservation/commit/4d52ed91ae9eaa7ec6091138c134e682c9434853))

##### Bug Fixes

-   add async client to %name\_%version/init.py ([4d52ed9](https://www.github.com/googleapis/python-bigquery-reservation/commit/4d52ed91ae9eaa7ec6091138c134e682c9434853))
-   disable always_use_jwt_access ([32b279f](https://www.github.com/googleapis/python-bigquery-reservation/commit/32b279f0666a55c66e87c347ed7e913c2a9267a7))
-   disable always_use_jwt_access ([#&#8203;126](https://www.github.com/googleapis/python-bigquery-reservation/issues/126)) ([32b279f](https://www.github.com/googleapis/python-bigquery-reservation/commit/32b279f0666a55c66e87c347ed7e913c2a9267a7))
-   exclude docs and tests from package ([#&#8203;117](https://www.github.com/googleapis/python-bigquery-reservation/issues/117)) ([4f90792](https://www.github.com/googleapis/python-bigquery-reservation/commit/4f90792c26c8e47aad5a52267c713723e661efa3))
-   require google-api-core >= 1.22.2 ([#&#8203;90](https://www.github.com/googleapis/python-bigquery-reservation/issues/90)) ([3f0fff7](https://www.github.com/googleapis/python-bigquery-reservation/commit/3f0fff779d880df0648b7bcf59df01c4cacd4ca3))

##### Documentation

-   omit mention of Python 2.7 in 'CONTRIBUTING.rst' ([#&#8203;1127](https://www.github.com/googleapis/python-bigquery-reservation/issues/1127)) ([#&#8203;120](https://www.github.com/googleapis/python-bigquery-reservation/issues/120)) ([7d65f87](https://www.github.com/googleapis/python-bigquery-reservation/commit/7d65f877f6814aed37f68116b52e200585587c58)), closes [#&#8203;1126](https://www.github.com/googleapis/python-bigquery-reservation/issues/1126)
-   Update the README to reflect that this library is GA ([#&#8203;112](https://www.github.com/googleapis/python-bigquery-reservation/issues/112)) ([7bca7a9](https://www.github.com/googleapis/python-bigquery-reservation/commit/7bca7a9b6d73d8c8ee522c8ac930192fad49da57))

</details>

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bigquery-reservation/snippets/requirements.txt

@@ -1 +1 @@
-google-cloud-bigquery-reservation==1.1.0
+google-cloud-bigquery-reservation==1.2.0