build(deps): update aws-smithy-runtime requirement from <=1.2 to <=1.6

[dependabot]

Updates the requirements on aws-smithy-runtime to permit the latest version.

Changelog

Sourced from aws-smithy-runtime's changelog.

April 30th, 2024

New this release:

• 🎉 (client, smithy-rs#119, smithy-rs#3595, smithy-rs#3593, smithy-rs#3585, smithy-rs#3571, smithy-rs#3569) Added support for waiters. Services that model waiters now have a Waiters trait that adds some methods prefixed with wait_until to the existing clients.

  For example, if there was a waiter modeled for "thing" that takes a "thing ID", using that waiter would look as follows:

  use my_generated_client::client::Waiters;
  let result = client.wait_until_thing()
  .thing_id("someId")
  .wait(Duration::from_secs(120))
  .await;

• 🐛 (all, smithy-rs#3603) Fix event stream :content-type message headers for struct messages. Note: this was the :content-type header on individual event message frames that was incorrect, not the HTTP content-type header for the initial request.

April 19th, 2024

New this release:

• 🎉 (server, smithy-rs#3430) Implement std::error::Error for ConstraintViolation
• (all, smithy-rs#3553) Upgraded MSRV to Rust 1.75

April 11th, 2024

New this release:

• 🎉 (all, smithy-rs#3485) Stalled stream protection now supports request upload streams. It is currently off by default, but will be enabled by default in a future release. To enable it now, you can do the following:

  let config = my_service::Config::builder()
      .stalled_stream_protection(StalledStreamProtectionConfig::enabled().build())
      // ...
      .build();

• 🐛 (all, smithy-rs#3427) SharedIdentityResolver now respects an existing cache partition when the ResolveIdentity implementation provides one already.

• 🐛 (all, smithy-rs#3485) Stalled stream protection on downloads will now only trigger if the upstream source is too slow. Previously, stalled stream protection could be erroneously triggered if the user was slowly consuming the stream slower than the minimum speed limit.

• 🐛 (all, smithy-rs#2546) Unions with unit target member shape are now fully supported

April 2nd, 2024

Breaking Changes:

• 🐛⚠️ (client, aws-sdk-rust#1111, smithy-rs#3513, @​Ten0) Make BehaviorVersion be future-proof by disallowing it to be constructed via the BehaviorVersion {} syntax.

... (truncated)

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[dependabot]

Superseded by #103.