Move to OpenTofu 1.6.0

Makefile

@@ -3,11 +3,11 @@ all: init fmt validate
 
 .PHONY: init
 init:
-	terraform init -upgrade=false
+	tofu init -upgrade=false
 
 .PHONY: initupgrade
 initupgrade:
-	terraform init -upgrade=true
+	tofu init -upgrade=true
 
 .PHONY: fmt
 fmt: init
@@ -15,7 +15,7 @@ fmt: init
 
 .PHONY: validate
 validate: init fmt
-	terraform validate
+	tofu validate
 
 .PHONY: clean
 clean:

terraform.tf

@@ -2,8 +2,8 @@ terraform {
   required_providers {
     linode = {
       source  = "linode/linode"
-      version = ">= 2.5.2"
+      version = ">= 2.9.0"
     }
   }
-  required_version = ">= 1.5.3, < 1.6.0"
+  required_version = ">= 1.6.0"
 }