feat: Update 'set' syntax in helm_resource to support v3

[yannickjones]

• Changed the syntax for the 'set' blocks in helm_release resources to arguments.
• Increase helm provider version to ">= 3.0"

Issue #218

Addresses the errors below:

│ Error: Unsupported block type

│ 

│   on .terraform/modules/runner-gke/modules/gh-runner-gke/main.tf line 130, in resource "helm_release" "arc_runners_set":

│  130:   set {

│ 

│ Blocks of type "set" are not expected here. Did you mean to define argument "set"? If so, use the equals sign to assign it a value.

╵

╷

│ Error: Unsupported block type

│ 

│   on .terraform/modules/runner-gke/modules/gh-runner-gke/main.tf line 135, in resource "helm_release" "arc_runners_set":

│  135:   set {

│ 

│ Blocks of type "set" are not expected here. Did you mean to define argument "set"? If so, use the equals sign to assign it a value.

╵

╷

│ Error: Unsupported block type

│ 

│   on .terraform/modules/runner-gke/modules/gh-runner-gke/main.tf line 140, in resource "helm_release" "arc_runners_set":

│  140:   dynamic "set" {

│ 

│ Blocks of type "set" are not expected here.

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