Move to OpenTofu 1.6.0

Makefile

@@ -3,19 +3,19 @@ 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
-	terraform fmt
+	tofu fmt
 
 .PHONY: validate
 validate: init fmt
-	terraform validate
+	tofu validate
 
 .PHONY: clean
 clean:

terraform.tf

@@ -5,5 +5,5 @@ terraform {
       version = ">= 2.30.0"
     }
   }
-  required_version = ">= 1.5.7, < 1.6.0"
+  required_version = ">= 1.6.0"
 }