Improve version printout in gr_satellites

The copyright statement had outdated years. This takes it from the
Python module, which is regularly kept updated. Also, fix the license
in the Python module and version printout to be formatted as the
SPDX identifier.

(cherry picked from commit ad8f700)

apps/gr_satellites

@@ -25,8 +25,11 @@ from satellites.satyaml import yamlfiles
 
 
 version = f"""gr_satellites {satellites.__version__}
-Copyright (C) 2020 Daniel Estevez
-License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
+
+{satellites.__copyright__}
+
+License GPL-3.0-or-later: GNU GPL version 3 or later
+<https://gnu.org/licenses/gpl.html>.
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law."""
 

python/__init__.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-# Copyright 2020-2024 Daniel Estevez <[email protected]>
+# Copyright 2020-2025 Daniel Estevez <[email protected]>
 #
 # This file is part of gr-satellites
 #
@@ -23,7 +23,7 @@
 __author__ = 'Daniel Estevez'
 __copyright__ = 'Copyright 2016-2025 Daniel Estevez'
 __email__ = '[email protected]'
-__license__ = 'GPL-3.0'
+__license__ = 'GPL-3.0-or-later'
 __all__ = [
     'ccsds',
     'components',