dependencies: pureos: Fix copyright header.

The history if the pureos-10 file is shared with the one of the
trisquel-10 file until the ubuntu2004 file was forked into the debian
file in the commit 8a79f7b163 ("Fix
https://notabug.org/libreboot/lbmk/issues/59").

Because of that, like the trisquel file, the pureos-10 file was first
introduced by Leah Rowe in 2014 as it cannot be found in 2013
Libreboot tarball releases (20131212, 20131213, 20131214) but it is
found in 20140711.

We then have the complete history through the
obsolete-repository-preserved-for-historical-purposes, osbmk and GNU
Boot repositories.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
neox: fixed own email address
Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>

resources/dependencies/pureos-10

@@ -2,7 +2,13 @@
 
 # trisquel-10 script: installs build dependencies for Ubuntu 20.04
 #
-#	Copyright (C) 2014, 2015, 2021 Leah Rowe <info@minifree.org>
+#	Copyright (C) 2014-2016, 2020-2021 Leah Rowe <info@minifree.org>
+#	Copyright (C) 2016, Klemens Nanni <contact@autoboot.org>
+#	Copyright (C) 2020, Wei Mingzhi <whistler_wmz@users.sf.net>
+#	Copyright (C) 2021, madbehaviorus <mad.behaviorus@mailbox.org>
+#	Copyright (C) 2021, Ron Nazarov <noisytoot@disroot.org>
+#	Copyright (C) 2023, Adrien Bourmault <neox@gnu.org>
+#	Copyright (C) 2023-2024 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
 #
 #    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