Bump okhttp from 3.14.8 to 4.7.2 in /examples

[dependabot]

Bumps okhttp from 3.14.8 to 4.7.2.

Changelog

Sourced from okhttp's changelog.

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 fix insecure hosts crash with an IllegalArgumentException on Android.

Version 4.7.0

2020-05-17

• New: HandshakeCertificates.Builder.addInsecureHost() makes it easy to turn off security in private development environments that only carry test data. Prefer this over creating an all-trusting TrustManager because only hosts on the allowlist are insecure. From [our DevServer sample][dev_server]:

  val clientCertificates = HandshakeCertificates.Builder()
      .addPlatformTrustedCertificates()
      .addInsecureHost("localhost")
      .build()
  val client = OkHttpClient.Builder()
  .sslSocketFactory(clientCertificates.sslSocketFactory(), clientCertificates.trustManager)
  .build()

• New: Add cacheHit, cacheMiss, and cacheConditionalHit() events to EventListener. Use these in logs, metrics, and even test cases to confirm your cache headers are configured as expected.

• New: Constant string okhttp3.VERSION. This is a string like "4.5.0-RC1", "4.5.0", or "4.6.0-SNAPSHOT" indicating the version of OkHttp in the current runtime. Use this to include the OkHttp version in custom User-Agent headers.

• Fix: Don't crash when running as a plugin in Android Studio Canary 4.1. To enable platform-specific TLS features OkHttp must detect whether it's running in a JVM or in Android. The upcoming Android Studio runs in a JVM but has classes from Android and that confused OkHttp!

• Fix: Include the header Accept: text/event-stream for SSE calls. This header is not added if

Commits

• 4c59555 Prepare for release 4.7.2.
• b733d29 Merge pull request #6073 from yschimke/android_init_ordering
• 1d183cb Fix Android init ordering
• 9c173d2 Merge pull request #6071 from yschimke/android_tests_safe_on_23
• d149069 Make the Android tests pass on <= 23
• 6fcabb1 Prepare next development version.
• 186ec88 Prepare for release 4.7.1.
• 67f77be Fix for insecureHost on Android (#6063)
• 370ebcf Prepare next development version.
• ef7c5f3 Prepare for release 4.7.0.
• Additional commits viewable in compare view

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