use node 18 (#343)

* use node 18

* Update webpack.common.js

Author: rom1504

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [18.x]
 
     steps:
     - uses: actions/checkout@v2

webpack.common.js

@@ -20,7 +20,7 @@ const config = {
       ), // Hack to allow creating the client in a browser
       express: false,
       net: 'net-browserify',
-      fs: 'memfs',
+      fs: false,
       jose: false
     },
     fallback: {