Bump okhttp from 3.2.0 to 4.1.1

[dependabot-preview]

Bumps okhttp from 3.2.0 to 4.1.1.

Changelog

Sourced from okhttp's changelog.

Version 4.1.1

2019-09-05

• Fix: Don't drop repeated headers when validating cached responses. In our Kotlin upgrade we
  introduced a regression where we iterated the number of unique header names rather than then
  number of unique headers. If you're using OkHttp's response cache this may impact you.

Version 4.1.0

2019-08-12

• OkHttp's new okhttp-brotli module implements Brotli compression. Install the interceptor to
  enable Brotli compression, which compresses 5-20% smaller than gzip.

  val client = OkHttpClient.Builder()
      .addInterceptor(BrotliInterceptor)
      .build()
  

  This artifact has a dependency on Google's Brotli decoder (95 KiB).

• New: EventListener.proxySelectStart(), proxySelectEnd() events give visibility into the
  proxy selection process.

• New: Response.byteString() reads the entire response into memory as a byte string.

• New: OkHttpClient.x509TrustManager accessor.

• New: Permit [new WebSocket response codes][iana_websocket]: 1012 (Service Restart), 1013 (Try
  Again Later), and 1014 (invalid response from the upstream).

• New: Build with Kotlin 1.3.41, BouncyCastle 1.62, and Conscrypt 2.2.1.

• Fix: Recover gracefully when a a coalesced connection immediately goes unhealthy.

• Fix: Defer the SecurityException when looking up the default proxy selector.

• Fix: Don't use brackets formatting IPv6 host names in MockWebServer.

• Fix: Don't permit cache iterators to remove entries that are being written.

Version 4.0.1

2019-07-10

• Fix: Tolerate null-hostile lists in public API. Lists created with List.of(...) don't like it
  when you call contains(null) on them!
• Fix: Retain binary-compatibility in okhttp3.internal.HttpHeaders.hasBody(). Some unscrupulous
  coders call this and we don't want their users to suffer.

Version 4.0.0

... (truncated)

Commits

• cf93aca Prepare for release 4.1.1.
• 1af74c6 Fix a regression in combining cache headers
• 4739b27 Prepare for release 4.1.0.
• 96fbf6b Merge pull request #5356 from square/jwilson.0812.no_application_plugin
• db39fa4 Remove the application plugin from okcurl
• f070df4 New OpenJDK 8 version (#5354)
• 1994136 Update test host to squareup (#5343)
• cf0042b Extended Android tests (#5298)
• 609888f Increase timeout for flaky test (#5305)
• f40e21a Allow interrupt of singleton cleanup thread (#5334)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #73.