Update copyright year reported by --version (#26032)

Author: sbc100

emcc.py

@@ -230,7 +230,7 @@ def main(args):
   if '--version' in args:
     print(cmdline.version_string())
     print('''\
-Copyright (C) 2025 the Emscripten authors (see AUTHORS.txt)
+Copyright (C) 2026 the Emscripten authors (see AUTHORS.txt)
 This is free and open source software under the MIT license.
 There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 ''')