Update provider version to reflect requirements

[rafmagns-skepa-dreag]

The provider requirement for Terraform 0.12.x appears to be lower than what is necessary to use this module. Per #184, which I experienced today, provider version should be ~> 2.37

terraform-aws-rds/versions.tf

Lines 4 to 6 in 9aff82b

	required_providers {
	aws = "~> 2.23"
	}

[antonbabenko]

I think you are right, so pull-request is welcome.

[github-actions]

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