Description of your changes

This PR applies 2 changes to the Dependabot config in an effort to further fine tune its behavior:

• Set labels: [ ] to disable labelling the PRs. This is done because labels are applied to the PR by another automation after the PR is opened and/or updated
• Add @smithy/** to the aws-sdk dependency group. This is done so that these dependencies are updated together with the SDK

Related issues, RFCs

Issue number: #1858

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my change is effective and works
• The PR title follows the conventional commit semantics

Breaking change checklist

Is it a breaking change?: NO

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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