Bump terraform-aws-modules/lambda/aws from 7.8.1 to 7.15.0 in /terraform/20-app #2457

Job	Run time
Unit test functions	36s
Build base env	12m 18s
Unit test coverage report	3s
Terraform plan	1m 57s
Terraform apply	2m 47s
Push docker images	2m 8s
Restart services	8m 6s
Terraform destroy	26m 39s
Clean up remaining resources	31s
	55m 5s

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