fix(core/utils): invalid request header Server (#9582)

Signed-off-by: Rongrong <15956627+Rongronggg9@users.noreply.github.com>

lib/utils/request-wrapper.js

@@ -102,9 +102,6 @@ const requestWrapper = (url, options) => {
         options.headers['user-agent'] = config.ua;
     }
 
-    // server
-    options.headers.server = 'RSSHub';
-
     try {
         const urlHandler = new URL(url);
         // referer