use sameSite: none for va cookie (GitbookIO#265)

Co-authored-by: Samy Pessé <samypesse@gmail.com>

Author: taranvohra

src/middleware.ts

@@ -587,6 +587,7 @@ function getLookupResultForVisitorAuth(
  value: getVisitorAuthCookieValue(basePath, visitorAuthToken),
  options: {
  httpOnly: true,
+ sameSite: 'none',
  secure: process.env.NODE_ENV === 'production',
  maxAge: 7 * 24 * 60 * 60,
  },