Update copyright year to 2026. (#30159)

LEGAL

@@ -1,7 +1,7 @@
 This file is part of Telegram Desktop,
 the official desktop application for the Telegram messaging service.
 
-Copyright (c) 2014-2025 The Telegram Desktop Authors.
+Copyright (c) 2014-2026 The Telegram Desktop Authors.
 
 Telegram Desktop is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by

Telegram/Resources/winrc/Telegram.rc

@@ -63,7 +63,7 @@ BEGIN
             VALUE "CompanyName", "Telegram FZ-LLC"
             VALUE "FileDescription", "Telegram Desktop"
             VALUE "FileVersion", "6.4.0.0"
-            VALUE "LegalCopyright", "Copyright (C) 2014-2025"
+            VALUE "LegalCopyright", "Copyright (C) 2014-2026"
             VALUE "ProductName", "Telegram Desktop"
             VALUE "ProductVersion", "6.4.0.0"
         END

Telegram/Resources/winrc/Updater.rc

@@ -54,7 +54,7 @@ BEGIN
             VALUE "CompanyName", "Telegram FZ-LLC"
             VALUE "FileDescription", "Telegram Desktop Updater"
             VALUE "FileVersion", "6.4.0.0"
-            VALUE "LegalCopyright", "Copyright (C) 2014-2025"
+            VALUE "LegalCopyright", "Copyright (C) 2014-2026"
             VALUE "ProductName", "Telegram Desktop"
             VALUE "ProductVersion", "6.4.0.0"
         END