bugfix: provider crash if body contains unknown float value

[ms-henglu]

related issue: #538 (comment)

When the body contains an unknown float number, the provider will crash.

For example:

resource "azapi_resource" "automationAccount1" {
  type      = "Microsoft.Automation/automationAccounts@2023-11-01"
  parent_id = azapi_resource.resourceGroup.id
  name      = "acctesthenglu021"
  location  = "westus"
  body = {
    properties = {
      sku = {
        name = "Basic"
        value = azapi_resource.automationAccount.output.properties.sku.name == "Basic" ? 1.1 : 1.2
      }
    }
  }
  schema_validation_enabled = false
  response_export_values = []
}