Update Concurrent.js

[i-am-the-slime]

✘ [ERROR] The symbol "createRoot" has already been declared

    output/React.Basic.DOM.Concurrent/foreign.js:6:16:
      6 │ export function createRoot(element) {
        ╵                 ~~~~~~~~~~

  The symbol "createRoot" was originally declared here:

    output/React.Basic.DOM.Concurrent/foreign.js:2:6:
      2 │ const createRoot = ReactDOM.createRoot || ReactDOM.unstable_createRoot;
        ╵       ~~~~~~~~~~

[i-am-the-slime]

Funnily esbuild does not work with server.js but only server because there's a module definition.

[andys8]

Cool, would solve the second issue mentioned in #42 (comment)

[mjrussell]

@i-am-the-slime we can close this now that #44 is merged right?