Chore: Update GitHub actions to use assumed role

[krisrjohnson21]

Summary of changes

Asana Ticket: Update application repos to use the new version of the GitHub action(s) (v2 tag)

This PR updates the deploy workflow to use v2 of the shared build-push-ecr and deploy-ecs actions. These updated actions assume an IAM role instead of relying on long-lasting AWS keys for an IAM user

[github-actions]

Coverage of commit 30cf98f

Summary coverage rate:
  lines......: 93.3% (1365 of 1463 lines)
  functions..: 82.9% (441 of 532 functions)
  branches...: no data found

Files changed coverage rate: n/a

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