fix(stepfunctions-tasks): custom resource uses subprocess with Shell=true

[otaviomacedo]

Using Shell=true in subprocess functions is considered a security vulnerability. To avoid using this argument, the command has to be passed as an array rather than a string.

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[gitpod-io]

[aws-cdk-automation]

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[otaviomacedo]

There are no changes to integ tests, but I ran the relevant one and it passed. Its snapshot has been updated accordingly.

✅ Updated pull request passes all PRLinter validations. Dissmissing previous PRLinter review.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 2e17030
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).