fix: plural_service_context configuration field type

[maciaszczykm]

resource "plural_service_context" "service_context" {
  name = "service-context-test"
  configuration = jsonencode({
    "env" = "prod"
    "test" = "some-value"
    "array" = [1, 2, 3]
    "nested_field" = {
      "test" = "nested-value"
    }
  })
  secrets = {
    "test" = "some-secret-value"
  }

[linear]

PROD-3029 `plural_service_context` configuration type should be any map, not map[string]string

[michaeljguarino]

Maybe fix the linter issue before merging though