Bump okhttp from 3.14.2 to 3.14.3 in /examples

[dependabot-preview]

Bumps okhttp from 3.14.2 to 3.14.3.

Changelog

Sourced from okhttp's changelog.

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

• 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
• eb053df Don't leak incoming bytes when we race incoming data and close
• 9ce9d1a Merge pull request #5351 from square/jwilson.0812.fix_flakiness
• 406a730 Merge pull request #5349 from square/recover-coal-conn
• 8c63a6c Fix flakiness in EventListenerTest.requestBodyFail().
• e9bffc4 Recover from a coalesced connection that immediately goes unhealthy.
• 10abb26 Merge pull request #5182 from jemaystermind/jt/syntax-higlighting
• Additional commits viewable in compare view

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