Rebump prod infra version to 2.8

infra/main.tf

@@ -26,7 +26,7 @@ module "env_dev" {
 module "env_prod" {
   # IMPORTANT: The prod environment is pinned to the latest release version, so it won't change during normal development.
   # See infra/README.md for how to deal with it during releases, when actual prod infra changes need to be made.
-  source    = "git::ssh://[email protected]/futurice/symptomradar.git//infra/modules/main?ref=v2.7"
+  source    = "git::ssh://[email protected]/futurice/symptomradar.git//infra/modules/main?ref=v2.8"
   providers = { aws.us_east_1 = aws.us_east_1 } # this alias is needed because ACM is only available in the "us-east-1" region
 
   name_prefix          = "${var.name_prefix}-prod"