Double capacity of api instance

We had attempted to move to the `c7g.xlarge` in a previous commit but
unfortunately that uses a different chip architecture (ARM).

There is also the c.xlarge but that is essentially the same price as the
m4.xlarge except with half the RAM.

Author: slifty

instances/dev/main.tf

@@ -32,7 +32,7 @@ variable "perm_env" {
 
 resource "aws_instance" "api" {
   ami                    = module.perm_env_data.backend_ami
-  instance_type          = "m4.large"
+  instance_type          = "m4.xlarge"
   vpc_security_group_ids = [module.perm_env_data.security_group]
   monitoring             = true
   private_ip             = "172.31.0.80"

instances/production/main.tf

@@ -32,7 +32,7 @@ variable "perm_env" {
 
 resource "aws_instance" "api" {
   ami                    = module.perm_env_data.backend_ami
-  instance_type          = "m4.large"
+  instance_type          = "m4.xlarge"
   vpc_security_group_ids = [module.perm_env_data.security_group]
   monitoring             = true
   subnet_id              = module.perm_env_data.subnet

instances/staging/main.tf

@@ -32,7 +32,7 @@ variable "perm_env" {
 
 resource "aws_instance" "api" {
   ami                    = module.perm_env_data.backend_ami
-  instance_type          = "m4.large"
+  instance_type          = "m4.xlarge"
   vpc_security_group_ids = [module.perm_env_data.security_group]
   monitoring             = true
   subnet_id              = module.perm_env_data.subnet