[Bug]: in deno deploy:TypeError: Deno.listenDatagram is not a function

### Problem description

in deno deploy:TypeError: Deno.listenDatagram is not a function

https://docs.deno.com/api/deno/~/Deno.listenDatagram

### Steps to reproduce

deno deploy
DENO_REGION: "us-east4",
DENO_DEPLOYMENT_ID: "xrdt2p2jkd4e"

### Expected behavior

no error

### Environment

deno deploy
DENO_REGION: "us-east4",
DENO_DEPLOYMENT_ID: "xrdt2p2jkd4e"

### Possible solution

--unstable-net

### Additional context

https://docs.deno.com/api/deno/~/Deno.listenDatagram

Start by reproducing the Deno Deploy failure with the deployment details in the issue and compare it with the Deno.listenDatagram API documentation. Check whether --unstable-net changes the result; done means the deployment no longer raises the TypeError, with the supported behavior documented or confirmed.

Written by the indexing model from the issue text.