Fix VPC issue in build packer job failures

Description

The build-packer job has been failing since Aug 30 with the following error:

Here is a link to the first offending build (I have clicked 'keep this build forever'): https://build.testeng.edx.org/job/build-packer-ami/14447/

Steps to Reproduce

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Current Behavior

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Expected Behavior

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Reason for Variance

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Release Notes

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User Impact Summary

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Assignee

Unassigned

Reporter

Stuart Young

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