new API, `Call.isCanceled()` to check if a call has been canceled.

 *  New: Update `MultipartBuilder` to support content length.
 *  New: Make it possible to mock `OkHttpClient` and `Call`.
 *  New: Update to h2-14 and hpack-9.
 *  New: OkHttp includes a user-agent by default, like `okhttp/2.1.0-RC1`.
 *  Fix: Handle response code `308 Permanent Redirect`.

  /**
   * Specifies a nanosecond-precision time source for this cache. By default, {@link
   * System#nanoTime} is used.
   *
   * <p>The primary intent of this method is to facilitate testing of caches with a fake or mock
   * time source.
   *
   * @return this {@code CacheBuilder} instance (for chaining)
   * @throws IllegalStateException if a ticker was already set
   */
  @CanIgnoreReturnValue

- github.com/coreos/etcd: [v3.3.13+incompatible → v3.3.10+incompatible](https://github.com/coreos/etcd/compare/v3.3.13...v3.3.10)
- github.com/golang/mock: [v1.3.1 → v1.1.1](https://github.com/golang/mock/compare/v1.3.1...v1.1.1)
- github.com/magiconair/properties: [v1.8.1 → v1.8.0](https://github.com/magiconair/properties/compare/v1.8.1...v1.8.0)

github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.5.0/go.mod h1:CWnOUgYIOo4TcNZ0wHX3YZCqsaM1I1Jvs6v3mP3KVu8=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=

    interface will make your code easier to test. When you test code that makes
    HTTP requests, you can use this interface to replace the real `OkHttpClient`
    with your own mocks or fakes.

    The interface will also let you use OkHttp's API with another HTTP client's
    implementation. This is useful in sandboxed environments like Google App
    Engine.

  /**
   * Specifies a nanosecond-precision time source for this cache. By default, {@link
   * System#nanoTime} is used.
   *
   * <p>The primary intent of this method is to facilitate testing of caches with a fake or mock
   * time source.
   *
   * @return this {@code CacheBuilder} instance (for chaining)
   * @throws IllegalStateException if a ticker was already set
   */
  @CanIgnoreReturnValue

### Failing Test

- Added mock framework support for unit tests for Windows in `kubeproxy`. ([#120105](https://github.com/kubernetes/kubernetes/pull/120105), [@princepereira](https://github.com/princepereira))

- github.com/Azure/go-autorest/autorest/date: [v0.3.0](https://github.com/Azure/go-autorest/tree/autorest/date/v0.3.0)
- github.com/Azure/go-autorest/autorest/mocks: [v0.4.2](https://github.com/Azure/go-autorest/tree/autorest/mocks/v0.4.2)
- github.com/Azure/go-autorest/autorest/to: [v0.4.0](https://github.com/Azure/go-autorest/tree/autorest/to/v0.4.0)

- github.com/Azure/go-autorest/autorest/date: [v0.1.0](https://github.com/Azure/go-autorest/autorest/date/tree/v0.1.0)
- github.com/Azure/go-autorest/autorest/mocks: [v0.2.0](https://github.com/Azure/go-autorest/autorest/mocks/tree/v0.2.0)
- github.com/Azure/go-autorest/autorest/to: [v0.2.0](https://github.com/Azure/go-autorest/autorest/to/tree/v0.2.0)

- github.com/gogo/protobuf: [v1.3.1 → v1.3.2](https://github.com/gogo/protobuf/compare/v1.3.1...v1.3.2)
- github.com/golang/mock: [v1.4.1 → v1.4.4](https://github.com/golang/mock/compare/v1.4.1...v1.4.4)
- github.com/google/cadvisor: [v0.38.5 → v0.39.0](https://github.com/google/cadvisor/compare/v0.38.5...v0.39.0)