Update AWS Firehose gem to 1.6

[sureshc]

This might resolve HTTP connectivity issues we saw on Sunday 9/16.

[islemaster]

Might be worth calling out that this also updates aws-sdk-core from 3.22.1 to 3.27.0.

Here's the relevant bits of the aws-sdk-firehose changelog, which doesn't tell us much,

1.6.0 (2018-09-06)
Feature - Adds code paths and plugins for future SDK instrumentation and telemetry.
1.5.0 (2018-09-05)
Feature - API update.

And here's the aws-sdk-core changelog.

3.27.0 (2018-09-06)
Feature - Adds code paths and plugins for future SDK instrumentation and telemetry to aws-sdk-sts.
3.26.0 (2018-09-05)
Feature - Updated Aws::STS::Client with the latest API changes.
Feature - Adds code paths and plugins for future SDK instrumentation and telemetry.
3.25.0 (2018-08-29)
Feature - Updated the list of parameters to filter when logging.
Issue - Add :exclude_presign option for #api_requests at client stubbing to allow excluding non-sent request from presigned url
3.24.1 (2018-08-13)
Issue - Update ca-bundle.crt file with newer root certificate authorities.
3.24.0 (2018-08-03)
Feature - Extensible Credential Providers, allows you to declare an executable to be run that outputs the credentials as a JSON payload allowing you to develop custom credential providers and easily add them to the credential resolution chain, Docs
3.23.0 (2018-07-31)
Feature - Add Logged API Requests interface to stubbed clients

Is the expectation that our pre-deploy test run will be sufficient to verify this change?

[wjordan]

Are there specific changes within this update that we expect/hope will resolve this issue, or is this just a matter of updating to the latest in case it does happen to offer a fix?

Either way I don't have any problems with the version bump, just wondering what our expectations are.

[sureshc]

There aren't any specific changes in the gem update that I expect to resolve this problem, but there have been several releases to the firehose gem in the last few months and AWS is likely to recommend updating when he re-opens the issue.