variable tyep to be updated

[hp4tel]

It seems in varaibles.tf the variable type needs to be updated. Here is the error output:

Error: Invalid quoted type constraints

236 | │
237 | │ on .terraform/modules/efs_alarms/variables.tf line 4, in variable "additional_endpoint_arns":
238 | │ 4: type = "list"
239 | │
240 | │ Terraform 0.11 and earlier required type constraints to be given in quotes,
241 | │ but that form is now deprecated and will be removed in a future version of
242 | │ Terraform. Remove the quotes around "list" and write list(string) instead
243 | │ to explicitly indicate that the list elements are strings.
244 | ╵
245 |  
246 | ╷
247 | │ Error: Invalid quoted type constraints
248 | │
249 | │ on .terraform/modules/efs_alarms/variables.tf line 10, in variable "sns_topic_arn":
250 | │ 10: type = "string"
251 | │
252 | │ Terraform 0.11 and earlier required type constraints to be given in quotes,
253 | │ but that form is now deprecated and will be removed in a future version of
254 | │ Terraform. Remove the quotes around "string".
255 | ╵
256 |  
257 | ╷
258 | │ Error: Invalid quoted type constraints
259 | │
260 | │ on .terraform/modules/efs_alarms/variables.tf line 16, in variable "add_sns_policy":
261 | │ 16: type = "string"
262 | │
263 | │ Terraform 0.11 and earlier required type constraints to be given in quotes,
264 | │ but that form is now deprecated and will be removed in a future version of
265 | │ Terraform. Remove the quotes around "string".
266 | ╵
267 |  
268 | ╷
269 | │ Error: Invalid quoted type constraints
270 | │
271 | │ on .terraform/modules/efs_alarms/variables.tf line 21, in variable "filesystem_id":
272 | │ 21: type = "string"
273 | │
274 | │ Terraform 0.11 and earlier required type constraints to be given in quotes,
275 | │ but that form is now deprecated and will be removed in a future version of
276 | │ Terraform. Remove the quotes around "string".
277 | ╵
278 |  
279 | ╷
280 | │ Error: Invalid quoted type constraints
281 | │
282 | │ on .terraform/modules/efs_alarms/variables.tf line 26, in variable "burst_credit_balance_threshold":
283 | │ 26: type = "string"
284 | │
285 | │ Terraform 0.11 and earlier required type constraints to be given in quotes,
286 | │ but that form is now deprecated and will be removed in a future version of
287 | │ Terraform. Remove the quotes around "string".
288 | ╵
289 |  
290 | ╷
291 | │ Error: Invalid quoted type constraints
292 | │
293 | │ on .terraform/modules/efs_alarms/variables.tf line 34, in variable "percent_io_limit_threshold":
294 | │ 34: type = "string"
295 | │
296 | │ Terraform 0.11 and earlier required type constraints to be given in quotes,
297 | │ but that form is now deprecated and will be removed in a future version of
298 | │ Terraform. Remove the quotes around "string".
299 | ╵