#2166 - Update Delivery Status Lambda SSM Processing

[k-macmillan]

Description

We saw a bunch of 403s from our delivery status lambda. That was because we allowed the auth param to be set to None. This PR fixes that.

Had to add two # nosec lines due to Bandit thinking those were secrets.

issue #2166

How Has This Been Tested?

Deployed. Used this test body in the lambda console and got an "Authenticated Twilio request" log statement. DD logs.

Checklist

• I have assigned myself to this PR
• PR has an appropriate title: #9999 - What the thing does
• PR has a detailed description, including links to specific documentation
• I have added the appropriate labels to the PR.
• I did not remove any parts of the template, such as checkboxes even if they are not used
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to any documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works. Testing guidelines
• I have ensured the latest main is merged into my branch and all checks are green prior to review
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• The ticket was moved into the DEV test column when I began testing this change

[MackHalliday]

Approved.