node_modules: update (#325)

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

node_modules/nodemailer/dist/cjs/dkim/message-parser.js

@@ -126,11 +126,18 @@ class MessageParser extends node_stream_1.Transform {
         // signature covers exactly the bytes the receiving side canonicalizes
         // Only SP and HTAB fold a line, and only they are trimmed from the field name, the
         // same whitespace the relaxed canonicalization in sign.ts works with
-        const lines = (this.rawHeaders || Buffer.alloc(0)).toString('binary').split(/\r?\n/);
-        for (let i = lines.length - 1; i > 0; i--) {
-            if (/^[ \t]/.test(lines[i])) {
-                lines[i - 1] += '\n' + lines[i];
-                lines.splice(i, 1);
+        const rawLines = (this.rawHeaders || Buffer.alloc(0)).toString('binary').split(/\r?\n/);
+        // Unfold in a single forward pass and only ever test a freshly split line for the
+        // continuation prefix. Testing an already merged line instead would rescan a string
+        // that grows with every continuation line, so a header folded into many continuation
+        // lines (a large recipient list, for example) would take quadratic time to unfold
+        const lines = [];
+        for (const rawLine of rawLines) {
+            if (lines.length && /^[ \t]/.test(rawLine)) {
+                lines[lines.length - 1] += '\n' + rawLine;
+            }
+            else {
+                lines.push(rawLine);
             }
         }
         return lines