Use the ID rather than the name when deleting env vars

[recurser]

With the current implementation I always get a 404 when deleting env-vars. Playing with the API directly, it seems that it requires the ID rather than the key:

$ curl -X DELETE -H 'content-type: application/json' -H "Authorization: bearer XXX" "https://api.vercel.com/v8/projects/prj_12345/env/DELETE_TEST"
{"error":{"code":"NOT_FOUND","message":"The Environment Variable \"DELETE_TEST\" was not found."}}⏎

vs:

$ curl -X DELETE -H 'content-type: application/json' -H "Authorization: bearer XXX" "https://api.vercel.com/v8/projects/prj_12345/env/oTe3FNJq5oy2WUwd"
{"type":"encrypted","value":"XXX","target":["production"],"configurationId":null,"id":"oTe3FNJq5oy2WUwd","key":"DELETE_TEST","createdAt":1628770103131,"updatedAt":1628770103131,"createdBy":"XXX","updatedBy":null}

Using this locally compiled provider against my terraform project fixes the issue:

I've also bumped the API version to match the example in the Vercel docs.

[chronark]

Yeah you are right, thanks.