fix: remove upper limit for required terraform version (#100)

Co-authored-by: [email protected] <[email protected]>

Author: akocbek

solutions/agents/version.tf

@@ -1,6 +1,6 @@
 terraform {
   # module uses nullable feature which is only available in versions >= 1.1.0
-  required_version = ">= 1.1.0, <1.7.0"
+  required_version = ">= 1.1.0"
 
   required_providers {
     # Lock DA into an exact provider version - renovate automation will keep it updated

solutions/instances/version.tf

@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">= 1.3.0, <1.7.0"
+  required_version = ">= 1.3.0"
   required_providers {
     # Lock DA into an exact provider version - renovate automation will keep it updated
     ibm = {

tests/resources/version.tf

@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">= 1.0.0, <1.7.0"
+  required_version = ">= 1.0.0"
   required_providers {
     ibm = {
       source  = "ibm-cloud/ibm"