Update utils.py deprecated style

[Dringho]

Issue #, if available:
Deprecated style update

Description of changes:
Update utils.py deprecated style seaborn-muted

Testing done:
Yes

Merge Checklist

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• I have verified that my PR does not contain any new notebook/s which demonstrate a SageMaker functionality already showcased by another existing notebook in the repository.
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AWS CodeBuild CI Report

• CodeBuild project: SageMakerNotebooksProd-USWEST2-sagemaker-examples-link-check
• Commit ID: f4ca6fa
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AWS CodeBuild CI Report

• CodeBuild project: SageMakerNotebooksProd-USWEST2-sagemaker-examples-code-formatting
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