Drop separate codeowners validation workflow (#74)

* Delete .github/workflows/validate-codeowners.yml

* Python 3.7 depricated. Use 3.12

Author: goruha

.github/workflows/validate-codeowners.yml

@@ -67,7 +67,7 @@ variable "skip_index_re" {
 
 variable "python_version" {
   type        = string
-  default     = "3.7"
+  default     = "3.12"
   description = "The Python version to use"
 }