fix os.version shim, improve docker image

shims/node/http.js

@@ -26,9 +26,14 @@ export function request(options, callback) {
   if (callback) {
     req.once("response", callback);
   }
-  // Immediately error  -  real HTTP requests need fetch or the proxy
+  // Immediately error. real HTTP requests need fetch or the proxy
   setTimeout(() => {
-    req.emit("error", new Error("http.request is not available in the web version. Use requestUrl() instead."));
+    req.emit(
+      "error",
+      new Error(
+        "http.request is not available in the web version. Use requestUrl() instead.",
+      ),
+    );
   }, 0);
   return req;
 }

shims/node/os.js

@@ -46,4 +46,8 @@ export function endianness() {
   return "LE";
 }
 
+export function version() {
+  return "v20.0.0";
+}
+
 export const EOL = "\n";