chore: make compile happy again

[cxa]

Using deno 2.5.2, this type checking blocks me to compile.

deno task compile
Task compile deno compile -o dist/lspx --allow-env --allow-run main.ts
Check file:///[redeact]/spx/main.ts
TS2345 [ERROR]: Argument of type 'WritableStream<Uint8Array<ArrayBufferLike>>' is not assignable to parameter of type 'WritableStream<any>'.
  The types of 'getWriter().closed' are incompatible between these types.
    Type 'Promise<void>' is not assignable to type 'Promise<undefined>'.
      Type 'void' is not assignable to type 'undefined'.
        Writable.fromWeb(options.write, { signal }),
                         ~~~~~~~~~~~~~
    at file:///[redeact]/lspx/lib/json-rpc-connection.ts:45:26

error: Type checking failed.

  info: The program failed type-checking, but it still might work correctly.
  hint: Re-run with --no-check to skip type-checking.

[cowboyd]

Thanks!