change deprecated resources

[mahaputrailhamawal]

The code includes the deprecated resource. For example, in the const.tf file, I changed the value "string" to string.
Source: https://developer.hashicorp.com/terraform/language/values/variables

In the s3.tf file, I change it resource to set a file to the bucket from aws_s3_bucket_object to aws_s3_object
Source: https://library.tf/providers/hashicorp/aws/latest/docs/resources/s3_bucket_object#resource-aws_s3_bucket_object

In lambda.tf, I changed the lambda runtime configuration from nodejs12.x to nodejs18.x. NodeJs 12.x in lambda function has been deprecated.
Source: https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html

Next, in the rds.tf file, I added the engine configuration to each rds_cluster created because the latest version of Terraform requires an engine declaration in the rds_cluster.
Source: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/rds_cluster

In the db-app.tf file, I changed name to db_name in the rds resource configuration.
Source: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/db_instance

Related issue: #497