fix(ext/node): set process.env as own property (#485)

cherry picked from upstream pr denoland/deno#27891

Author: nyannyacha

ext/node/polyfills/process.ts

@@ -743,6 +743,7 @@ const process = new Process();
 
 /* Set owned property */
 process.versions = versions;
+process.env = env;
 
 Object.defineProperty(process, Symbol.toStringTag, {
   enumerable: false,