Update aws sdk to v1.35.4

[b-dean]

Description of changes:
I was running into an issue where the credentials from credential_process in my ~/.aws/config were not valid JSON because they were being truncated.

$ docker-credential-ecr-login list
ecr: could not list credentials: ecr: Failed to get authorization token: ProcessProviderParseError: parse failed of credential_process output: {"Version":1,"AccessKeyId":"ASIAxxxxxxxxxxxxxxxxx","SecretAccessKey":"xxxxxxxxxxxx","SessionToken":"xxxx...more...xxxxx
caused by: unexpected end of JSON input

This is fixed in the aws sdk in v1.25.42, but I figured we might as well update to the latest sdk.

This would also fix @fred-vogt's issues in PR #223 and issue #215

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[rittneje]

@samuelkarp @kzys @nmeyerhans Can this PR be merged? The version of the SDK currently being used is quite out of date (over a year old). I would like to be able to leverage the AWS_ROLE_ARN environment variable that was added recently.

[kzys]

Looks good to me. Let me sync-up with @samuelkarp.

[krmichelos]

It is great that this has been merged. @kzys or @samuelkarp is there a planned release soon that will contain this change?

[zvymazal]

@samuelkarp Is there a target date for the next release in which this update will be released?

[kzys]

We don't have the target date yet, but we are going to create a new release which will include this change.