Finish switch from iam user to role

Description of changes: Switch to using IAM Role that is more secure with short-lived credentials

See #448 for context, we missed this one.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: thpierce

.github/workflows/IntegrationTesting.yaml

@@ -156,10 +156,9 @@ jobs:
           name: terraform-state-artifact
 
       - name: Configure AWS Credentials
-        uses: aws-actions/configure-aws-credentials@v1
+        uses: aws-actions/configure-aws-credentials@v4
         with:
-          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
-          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          role-to-assume: ${{ secrets.AWS_INTEG_TEST_ROLE_ARN }}
           aws-region: us-west-2
 
       - name: Setup Terraform