terraform-eventbridge-scheduled-lambda: Update runtime to python3.12

[kakakakakku]

Issue #, if available:
N/A

Description of changes:
Hi😀 Thanks for the useful patterns!

I updated the Lambda Python runtime version to python3.12.

While testing terraform-eventbridge-scheduled-lambda, I noticed that the Lambda runtime version python3.8 was deprecated. Although it's still deployable at the moment, it will not be allowed after October 1, 2025.
https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html

To prevent future deployment issues, I updated the runtime to python3.12.
https://github.com/terraform-aws-modules/terraform-aws-lambda

Check

terraform apply completed successfully and works good.

Warning

Warning is likely caused by the fact that the AWS provider version is currently at v6 (due to >= 4.9 constraint), and data.aws_region.current.name is now a deprecated attribute. There is no functional impact at this time👍

╷
│ Warning: Deprecated attribute
│ 
│   on .terraform/modules/lambda_function/outputs.tf line 9, in output "lambda_function_arn_static":
│    9:   value       = local.create && var.create_function && !var.create_layer ? "arn:aws:lambda:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:function:${var.function_name}" : ""
│ 
│ The attribute "name" is deprecated. Refer to the provider documentation for details.
│ 
│ (and one more similar warning elsewhere)
╵

Thank you😀

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[kakakakakku]

note: I think it’s better if the user can choose the profile to use😀 For example, I also referred to terraform-s3-lambda and terraform-lambda-sfn.

• https://github.com/aws-samples/serverless-patterns/blob/main/terraform-s3-lambda/main.tf
• https://github.com/aws-samples/serverless-patterns/blob/main/terraform-lambda-sfn/main.tf