Add aws-session-token to AWS credentials configuration

Author: robertjndw

.github/workflows/deploy_aws.yml

@@ -16,6 +16,7 @@ jobs:
         with:
           aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
           aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          aws-session-token: ${{ secrets.AWS_SESSION_TOKEN }}
           aws-region: ${{ secrets.AWS_REGION }}
 
       - name: Install AWS Copilot CLI