Ignoring LOW tfsec vulnerability for web_acl cloudwatch log group

[adityacb15]

While accessing the WAFv2 module in our repo (platform-services-observability), we faced this issue during a tfsec scan.

Result #1 LOW Log group is not encrypted. 
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  github.com/RSS-Engineering/terraform/modules/wafv2?ref=53cbaac6891da31d4b4f4bbcecbe36a9b8a120c6/main.tf:219-222
   via infra/sso/main.tf:110-120 (module.wafv2)
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  219    resource "aws_cloudwatch_log_group" "web_acl_log" {
  220      name  = "aws-waf-logs-${var.stage}_${var.region}_${var.service_name}"
  221      count = var.enabled
  222    }
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          ID aws-cloudwatch-log-group-customer-key
      Impact Log data may be leaked if the logs are compromised. No auditing of who have viewed the logs.
  Resolution Enable CMK encryption of CloudWatch Log Groups

  More Information
  - https://aquasecurity.github.io/tfsec/v1.28.14/checks/aws/cloudwatch/log-group-customer-key/
  - https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_log_group#kms_key_id