Update dependency com.squareup.okhttp3:okhttp to v4.9.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.squareup.okhttp3:okhttp (source)	4.9.0 -> 4.9.1

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Release Notes

square/okhttp

### [`v4.9.1`](https://togithub.com/square/okhttp/blob/master/CHANGELOG.md#Version-491) _2021-01-30_ - Fix: Work around a crash in Android 10 and 11 that may be triggered when two threads concurrently close an SSL socket. This would have appeared in crash logs as `NullPointerException: bio == null`.

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[mergify[bot]]

Nice! PR successfully merged.