node_modules: update (#314)

Co-authored-by: dawidd6 <9713907+dawidd6@users.noreply.github.com>

node_modules/nodemailer/lib/dkim/index.js

@@ -10,6 +10,7 @@ const { PassThrough } = require('stream');
 const fs = require('fs');
 const path = require('path');
 const crypto = require('crypto');
+const { copyOwnKeys } = require('../shared/objects');
 
 const DKIM_ALGO = 'sha256';
 const MAX_MESSAGE_SIZE = 2 * 1024 * 1024; // buffer messages larger than this to disk
@@ -225,7 +226,11 @@ class DKIM {
 
         let options = this.options;
         if (extraOptions && Object.keys(extraOptions).length) {
-            options = Object.assign({}, extraOptions, this.options);
+            // extraOptions is mail.data._dkim, caller supplied message data. An own
+            // "__proto__" key there would let every option this signer reads and the
+            // transport did not set, such as skipFields, answer from the caller
+            options = copyOwnKeys({}, extraOptions);
+            copyOwnKeys(options, this.options);
         }
 
         const signer = new DKIMSigner(options, this.keys, inputStream, output);