docs: update license year range to 2024 (dashpay#5890)

## What was done?
Happy new year and happy new lunar year!
2024 is here and 20.1 is coming.

## Breaking Changes
N/A

## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone

Author: knst

COPYING

@@ -1,8 +1,8 @@
 The MIT License (MIT)
 
-Copyright (c) 2009-2020 The Bitcoin Core developers
-Copyright (c) 2009-2020 Bitcoin Developers
-Copyright (c) 2014-2020 The Dash Core developers
+Copyright (c) 2009-2024 The Bitcoin Core developers
+Copyright (c) 2009-2024 Bitcoin Developers
+Copyright (c) 2014-2024 The Dash Core developers
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

configure.ac

@@ -4,7 +4,7 @@ define(_CLIENT_VERSION_MAJOR, 20)
 define(_CLIENT_VERSION_MINOR, 1)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_IS_RELEASE, false)
-define(_COPYRIGHT_YEAR, 2023)
+define(_COPYRIGHT_YEAR, 2024)
 define(_COPYRIGHT_HOLDERS,[The %s developers])
 define(_COPYRIGHT_HOLDERS_SUBSTITUTION,[[Dash Core]])
 AC_INIT([Dash Core],m4_join([.], _CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MINOR, _CLIENT_VERSION_BUILD),[https://github.com/dashpay/dash/issues],[dashcore],[https://dash.org/])

contrib/debian/copyright

@@ -1,11 +1,11 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: Dash Core
-Upstream-Contact: Dash Core Group, Inc https://www.dash.org/team/
+Upstream-Contact: Dash Core Group, Inc https://www.dash.org/dcg/
 Source: https://github.com/dashpay/dash
 
 Files: *
-Copyright: 2009-2020, Bitcoin Core Developers,
-           2019-2020, Dash Core Developers
+Copyright: 2009-2024, Bitcoin Core Developers,
+           2019-2024, Dash Core Developers
 License: Expat
 Comment: The Bitcoin Core Developers encompasses the current developers listed on bitcoin.org,
          as well as the numerous contributors to the project. The Dash Core Developers