Bump okhttp from 3.12.1 to 4.8.1

[dependabot]

Bumps okhttp from 3.12.1 to 4.8.1.

Changelog

Sourced from okhttp's changelog.

Version 4.8.1

2020-08-06

• Fix: Don't crash in HeldCertificate.Builder when creating certificates on older versions of Android, including Android 6. We were using a feature of SimpleDateFormat that wasn't available in those versions!

Version 4.8.0

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.

Version 4.7.2

2020-05-20

• Fix: Don't crash inspecting whether the host platform is JVM or Android. With 4.7.0 and 4.7.1 we had a crash IllegalArgumentException: Not a Conscrypt trust manager because we depended on initialization order of companion objects.

Version 4.7.1

2020-05-18

• Fix: Pass the right arguments in the trust manager created for addInsecureHost(). Without the

Commits

• fc6c29c Prepare for release 4.8.1.
• 506e840 Implement DER constraints on date formats (#6213)
• a70e992 Prepare for release 4.8.0.
• cf367d9 Add defensive checks for malformed ASN.1 DER (#6180)
• 0e0f3a2 Push OkHttp 3.14.x into the sea. It is no longer supported. (#6179)
• 7c9cfd6 Fix typo (#6178)
• 4bfa33e Upgrade to Okio 2.7.0 (#6175)
• c4cbb57 Don't crash on unknown GeneralName types. (#6170)
• 19e9a8f Drop support for indefinite length in DER (#6166)
• c04b57e Add limits to what length values DerReader supports (#6164)
• Additional commits viewable in compare view

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[baywet]

NOTE: there's a bunch of references to okhttp3 in the code which I think we need to upgrade as well.
Also, this would probably need to be coordinated with the service library to avoid breaking E2E experience. Pushing to milestone 2.0.0

[dependabot]

A newer version of com.squareup.okhttp3:okhttp exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[baywet]

depends on #58