About: Update copyright date.

src/View/About/Window.py

@@ -1,5 +1,5 @@
 # Window.py -- Pamhyr
-# Copyright (C) 2023  INRAE
+# Copyright (C) 2023-2024  INRAE
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -67,5 +67,5 @@ class AboutWindow(PamhyrDialog):
                     label = f"\n  - {author}" + label
             except StopIteration:
                 label = _translate("About", "Contributors: ") + label
-                label = "Copyright © 2023  INRAE\n" + label
+                label = "Copyright © 2023-2024  INRAE\n" + label
                 self.set_label_text("label_copyright", label)