Update to modus-themes version 4.5.0

Update to modus-themes version 4.5.0

* doc/misc/modus-themes.org (COPYING): Update the version headers.
(Option to extend the palette): Document new user options.
(Full support for packages or face groups): Document more
packages that are explicitly supported by the themes.
(Acknowledgements): Update the list of people who have
contributed to the project in one way or another.

* etc/themes/modus-operandi-deuteranopia-theme.el:
* etc/themes/modus-operandi-deuteranopia-theme.el:
* etc/themes/modus-operandi-tinted-theme.el:
* etc/themes/modus-operandi-tritanopia-theme.el:
* etc/themes/modus-vivendi-deuteranopia-theme.el:
* etc/themes/modus-vivendi-theme.el:
* etc/themes/modus-vivendi-tinted-theme.el:
* etc/themes/modus-vivendi-tritanopia-theme.el: Update the
  palette of each theme and include the new user option to extend
  its palette.

* etc/themes/modus-themes.el: Cover more faces and include user
  option for common extension to all theme palettes.

Detailed release notes:
<https://protesilaos.com/codelog/2024-08-21-modus-themes-4-5-0/>.

(cherry picked from commit 3efb89ddb9633569a1ef3a4a7ffad0ce68e1ef29)