Bump okhttp from 3.14.2 to 3.14.4 in /core

[dependabot-preview]

Bumps okhttp from 3.14.2 to 3.14.4.

Changelog

Sourced from okhttp's changelog.

Version 3.14.4

2019-09-29

• Fix: Cancel calls that fail due to unexpected exceptions. We had a bug where an enqueued call
  would never call back if it crashed with an unchecked throwable, such as a
  NullPointerException or OutOfMemoryError. We now call Callback.onFailure() with an
  IOException that reports the call as canceled. The triggering exception is still delivered to
  the thread's UncaughtExceptionHandler.
• Fix: Don't evict incomplete entries when iterating the cache. We had a bug where iterating
  Cache.urls() would prevent in-flight entries from being written.

Version 3.14.3

2019-09-10

• Fix: Don't lose HTTP/2 flow control bytes when incoming data races with a stream close. If this
  happened enough then eventually the connection would stall.

• Fix: Acknowledge and apply inbound HTTP/2 settings atomically. Previously we had a race where we
  could use new flow control capacity before acknowledging it, causing strict HTTP/2 servers to
  fail the call.

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

Commits

• 488b8f4 [maven-release-plugin] prepare release parent-3.14.4
• 3865ee0 Merge pull request #5503 from square/jwilson.0926.unchecked_314x
• 4471395 Cancel calls on unexpected exceptions (3.14.x branch)
• c8833f6 Merge pull request #5486 from square/jwilson.0922.issue_3905_314
• 7938fbc DiskLruCache snapshot() method removing entries that are being cached (3.14.x...
• df3d489 [maven-release-plugin] prepare for next development iteration
• 9669149 [maven-release-plugin] prepare release parent-3.14.3
• 55f9d53 Merge pull request #5436 from square/jwilson.0909.cherry_pick_http2
• 8af53d5 Merge pull request #5438 from square/jwilson.0909.atomic_settings
• a724806 Acknowledge and apply inbound settings atomically
• Additional commits viewable in compare view

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[rnorth]

/AzurePipelines run Windows 10 - Docker for Windows

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Azure Pipelines successfully started running 1 pipeline(s).

[rnorth]

/AzurePipelines run Windows 10 - Docker for Windows

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Azure Pipelines successfully started running 1 pipeline(s).

[rnorth]

Tests are passing on CI (including on Windows) and the changelog looks like there's not going to be anything risky here. Will merge.