fix(credential-provider-node): update date strings to use fully specified offsets

[syall]

Issue

Issue number, if available, prefixed with "#"

When running yarn test:integration locally in credential-provider-node, the expiration for container-authorization would be off by a local offset.

      Object {
        "accessKeyId": "CONTAINER_ACCESS_KEY",
    -   "expiration": 3000-01-01T08:00:00.000Z,
    +   "expiration": 3000-01-01T00:00:00.000Z,
        "secretAccessKey": "CONTAINER_SECRET_ACCESS_KEY",
        "sessionToken": "CONTAINER_TOKEN",
      }

Description

What does this implement/fix? Explain your changes.

Update date strings to use fully specified offsets.

Testing

How was this change tested?

1. yarn test:integration
2. CI passes

Additional context

Add any other context about the PR here.

N/A.

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

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