feat(sandbox): add sandboxed request to Python SDK [replica of harness-sdk PR 4756] - #36

Credentials could not be loaded, please check your action inputs: Could not load credentials from any providers

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: aws-actions/configure-aws-credentials@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/