bug(terraform): Detecting valid label as invalid

[SimonDreher]

kics incorrectly detects valid labels as "Metadata Label Is Invalid"

Example:

resource "kubernetes_config_map" "gateway_class_defaults" {
  metadata {
    name = "gateway-class-defaults"
    labels = {
      "gateway.istio.io/defaults-for-class" = "something"
    }
  }

  data = {
    a = "b"
  }
}

Kubernetes allows a single slash: https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/#syntax-and-character-set, which is a common pattern for labels and annotations.

The regex in kics does not: https://github.com/Checkmarx/kics/pull/2595/files#diff-613f4a5ed1b42d778d1dc4b070e5bde3cfbbd4606c24e2476ea5e95ff318f7dcR8

Expected Behavior

No error for labels with prefix

Actual Behavior

...
Metadata Label Is Invalid, Severity: LOW, Results: 3
Description: Check if any label in the metadata is invalid.
Platform: Terraform
CWE: 710
Risk Score: 3.3
Learn more about this vulnerability: https://docs.kics.io/latest/queries/terraform-queries/bc3dabb6-fd50-40f8-b9ba-7429c9f1fb0e

...

	[3]: ../../data/gateway.tf:94

		093: 
		094:     labels = {
		095:       "gateway.istio.io/defaults-for-class" = "something"

...

Steps to Reproduce the Problem

Just scan the example above

Specifications

N/A