fix: `DedicatedWorkerGlobalScope.close()` and `SharedWorkerGlobalScope.close()` return type - `never`

[turansky]

• DedicatedWorkerGlobalScope.close() - MDN
• SharedWorkerGlobalScope.close() - MDN

[github-actions[bot]]

Thanks for the PR!

This section of the codebase is owned by @saschanaz - if they write a comment saying "LGTM" then it will be merged.

[turansky]

@microsoft-github-policy-service agree

[saschanaz]

This is not necessarily true:

new Worker(URL.createObjectURL(new Blob([`
  self.close();
  console.log("closed?");
`])))

// You can see "closed?" on devtools console

[turansky]

@saschanaz thank you for example