fix: check user input on dotenv.stringify

closes google#1093

Author: antongolub

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "zx",
-  "version": "8.4.0",
+  "version": "8.3.2",
   "description": "A tool for writing better scripts",
   "type": "module",
   "main": "./build/index.cjs",
@@ -110,7 +110,7 @@
     "cronometro": "^4.0.3",
     "depseek": "^0.4.1",
     "dts-bundle-generator": "^9.5.1",
-    "envapi": "^0.2.1",
+    "envapi": "^0.2.3",
     "esbuild": "^0.24.2",
     "esbuild-node-externals": "^1.16.0",
     "esbuild-plugin-entry-chunks": "^0.1.15",