feat: use caret range for aws-sdk deps

[monholm]

Description of changes

This pull request migrates all aws-sdk dependencies to use caret version range.

The aws-sdk is a rather large dependency, and most of it's packages are highly entangled and depend on fixed versions, i.e. adding a single package as a dependency installs quite a few other packages from aws-sdk.

As an example, installing @aws-sdk/client-firehose (a dep of @aws-amplify/analytics) adds 22 different aws-sdk packages.

This becomes quite annoying if depending on aws-sdk myself, as it will result in a lot of duplicate packages with varying versions, or alternatively forcing me to use the same (old) version that aws-amplify depends on.

The aws-sdk is strict on not introducing breaking changes, so I see no reasing enforcing a specific version :)

Checklist

• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

Checklist for repo maintainers

• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows
• New source file paths included in this PR have been added to CODEOWNERS, if appropriate

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