Add Telegram secret backup IP-CIDR

Build/build-telegram-cidr.ts

@@ -12,7 +12,11 @@ export const getTelegramCIDRPromise = createMemoizedPromise(async () => {
   const lastModified = resp.headers.get('last-modified');
   const date = lastModified ? new Date(lastModified) : new Date();
 
-  const ipcidr: string[] = [];
+  const ipcidr: string[] = [
+    // Telegram secret backup CIDR, announced by AS62041
+    // see also https://github.com/Telegram-FOSS-Team/Telegram-FOSS/blob/10da5406ed92d30c6add3b25d40b2b3b6995d873/TMessagesProj/src/main/java/org/telegram/tgnet/ConnectionsManager.java#L1157
+    '95.161.64.0/20'
+  ];
   const ipcidr6: string[] = [];
 
   for await (const cidr of createReadlineInterfaceFromResponse(resp, true)) {