azurerm_key_vault_certificate_contacts - in v4.0 make the contact field optional to allow for deletion of contacts from the key vault. / azurerm_key_vault - deprecate the contact field from v3.x provider and update properties to Computed Optional.

azurerm_key_vault_certificate_contacts - in v4.0 make the contact field optional to allow for deletion of contacts from the key vault. / azurerm_key_vault - deprecate the contact field from v3.x provider and update properties to Computed Optional. #15572