feat: Use gp3 as default as it saves 20% and is more performant (te…

…rraform-aws-modules#1134)

BREAKING CHANGES: The default root volume type is now `gp3` as it saves 20% and is more performant

local.tf

@@ -43,7 +43,7 @@ locals {
     spot_price                    = ""                          # Cost of spot instance.
     placement_tenancy             = ""                          # The tenancy of the instance. Valid values are "default" or "dedicated".
     root_volume_size              = "100"                       # root volume size of workers instances.
-    root_volume_type              = "gp2"                       # root volume type of workers instances, can be 'standard', 'gp2', or 'io1'
+    root_volume_type              = "gp3"                       # root volume type of workers instances, can be "standard", "gp3", "gp2", or "io1"
     root_iops                     = "0"                         # The amount of provisioned IOPS. This must be set with a volume_type of "io1".
     root_volume_throughput        = null                        # The amount of throughput to provision for a gp3 volume.
     key_name                      = ""                          # The key pair name that should be used for the instances in the autoscaling group