Update dependency com.squareup.okhttp3:okhttp to v4.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
com.squareup.okhttp3:okhttp (source)	minor	4.7.2 -> 4.8.0

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Release Notes

square/okhttp

### [`v4.8.0`](https://togithub.com/square/okhttp/blob/master/CHANGELOG.md#Version-480) _2020-07-11_ - New: Change `HeldCertificate.Builder` to use its own ASN.1 certificate encoder. This is part of our effort to remove the okhttp-tls module's dependency on Bouncy Castle. We think Bouncy Castle is great! But it's a large dependency (6.5 MiB) and its security provider feature impacts VM-wide behavior. - New: Reduce contention for applications that make a very high number of concurrent requests. Previously OkHttp used its connection pool as a lock when making changes to connections and calls. With this change each connection is locked independently. - Upgrade: [Okio 2.7.0][okio_2_7_0]. ```kotlin implementation("com.squareup.okio:okio:2.7.0") ``` - Fix: Avoid log messages like "Didn't find class org.conscrypt.ConscryptHostnameVerifier" when detecting the TLS capabilities of the host platform. - Fix: Don't crash in `HttpUrl.topPrivateDomain()` when the hostname is malformed. - Fix: Don't attempt Brotli decompression if the response body is empty.

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[mergify[bot]]

Nice! PR successfully merged.