Updates Customer SH Modules to 4.0.13 to bypass troublesome WAF rule

prod/aws-us-gov/mdr-prod-frtib/190-splunk-customer-searchhead/terragrunt.hcl

@@ -13,7 +13,7 @@ locals {
 # working directory, into a temporary folder, and execute your Terraform commands in that folder.
 terraform {
   # Double slash is intentional and required to show root of modules
-  source = "git@github.xdr.accenturefederalcyber.com:mdr-engineering/xdr-terraform-modules.git//base/splunk_servers/customer_searchhead?ref=v3.6.0"
+  source = "git@github.xdr.accenturefederalcyber.com:mdr-engineering/xdr-terraform-modules.git//base/splunk_servers/customer_searchhead?ref=v4.0.13"
 }
 
 dependency "vpc" {

test/aws-us-gov/mdr-test-modelclient/190-splunk-customer-searchhead/terragrunt.hcl

@@ -13,7 +13,7 @@ locals {
 # working directory, into a temporary folder, and execute your Terraform commands in that folder.
 terraform {
   # Double slash is intentional and required to show root of modules
-  source = "git@github.xdr.accenturefederalcyber.com:mdr-engineering/xdr-terraform-modules.git//base/splunk_servers/customer_searchhead?ref=v3.6.0"
+  source = "git@github.xdr.accenturefederalcyber.com:mdr-engineering/xdr-terraform-modules.git//base/splunk_servers/customer_searchhead?ref=v4.0.13"
 }
 
 dependency "vpc" {