chore: bump tf code used in tests to require tf >= 1.9.0 (#172)

Author: ocofaigh

tests/resources/Readme.md renamed to tests/resources/README.md

@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">= 1.3.0"
+  required_version = ">= 1.9.0"
   required_providers {
     ibm = {
       source  = "ibm-cloud/ibm"