fix: add missing comma to ssm command

What was the problem/requirement? (What/Why)

We were missing a comma in an ssm command list. Unfortunately in Python having two string on a separate line in a list is valid syntax and it concats the two lines together.

What was the solution? (How)

Add the missing commas!

What is the impact of this change?

Integ tests pass.

How was this change tested?

I added the new build to the requirements-test.txt in the deadline worker agent repo. I then made sure the change was in the hatch environment. I ran the linux e2e tests and made sure they passed.

Was this change documented?

N/A

Is this a breaking change?

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aws-deadline / deadline-cloud-test-fixtures