renovatebot(deps): update dependency com.squareup.okhttp3:okhttp to v4.2.1
renovatebot(deps): update dependency com.squareup.okhttp3:okhttp to v4.2.1

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.squareup.okhttp3:okhttp](https://togithub.com/square/okhttp) ([source](https://togithub.com/square/okhttp)) | patch | `4.2.0` -> `4.2.1` |

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### Release Notes

<details>
<summary>square/okhttp</summary>

### [`v4.2.1`](https://togithub.com/square/okhttp/blob/master/CHANGELOG.md#Version-421)

_2019-10-02_

-   Fix: In 4.1.0 we introduced a performance regression that prevented connections from being
    pooled in certain situations. We have good test coverage for connection pooling but we missed
    this because it only occurs if you have proxy configured and you share a connection pool among
    multiple `OkHttpClient` instances.

    This particularly-subtle bug was caused by us assigning each `OkHttpClient` instance its own
    `NullProxySelector` when an explicit proxy is configured. But we don't share connections when
    the proxy selectors are different. Ugh!

</details>

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