Update copyright years

ruby/caca-canvas.c

@@ -1,6 +1,6 @@
 /*
  *  libcaca Ruby bindings
- *  Copyright © 2007—2014 Pascal Terjan <pterjan@linuxfr.org>
+ *  Copyright © 2007—2026 Pascal Terjan <pterjan@linuxfr.org>
  *              2021 Sam Hocevar <sam@hocevar.net>
  *              All Rights Reserved
  *

ruby/caca-display.c

@@ -1,6 +1,6 @@
 /*
  *  libcaca Ruby bindings
- *  Copyright (c) 2007-2012 Pascal Terjan <pterjan@linuxfr.org>
+ *  Copyright (c) 2007-2026 Pascal Terjan <pterjan@linuxfr.org>
  *
  *  This library is free software. It comes without any warranty, to
  *  the extent permitted by applicable law. You can redistribute it

ruby/caca-dither.c

@@ -1,6 +1,6 @@
 /*
  *  libcaca Ruby bindings
- *  Copyright (c) 2007-2012 Pascal Terjan <pterjan@linuxfr.org>
+ *  Copyright (c) 2007-2026 Pascal Terjan <pterjan@linuxfr.org>
  *
  *  This library is free software. It comes without any warranty, to
  *  the extent permitted by applicable law. You can redistribute it

ruby/caca-font.c

@@ -1,6 +1,6 @@
 /*
  *  libcaca Ruby bindings
- *  Copyright (c) 2007-2012 Pascal Terjan <pterjan@linuxfr.org>
+ *  Copyright (c) 2007-2026 Pascal Terjan <pterjan@linuxfr.org>
  *
  *  This library is free software. It comes without any warranty, to
  *  the extent permitted by applicable law. You can redistribute it