chore(deps): update dependency com.squareup.okhttp3:mockwebserver to v4.8.0

[renovate]

This PR contains the following updates:

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

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Release Notes

square/okhttp

v4.8.0

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].

  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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