Update modus-themes to their version 4.8.0

Update modus-themes to their version 4.8.0

* doc/misc/modus-themes.org (Preview theme colors):(Get a single color from the palette with ~modus-themes-get-color-value~):
(DIY Do not extend the region background, Note on SHR fonts): Fix some typos.
(Full support for packages or face groups): Include tmr in the
list of supported packages.
(Acknowledgements): Mention more people who have contributed to
the project in some capacity.

* etc/themes/modus-operandi-deuteranopia-theme.el:
* etc/themes/modus-operandi-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: Make small changes to the palette of each theme.

* etc/themes/modus-themes.el
(modus-themes-after-load-theme-hook): Reword the doc string
(modus-themes--rotate, modus-themes--rotate-p)
(modus-themes--next-in-rotation, modus-themes-rotate): Make
rotation optionally move in the opposite direction.
(modus-themes-faces): Tweak some faces.

Release notes: <https://protesilaos.com/codelog/2025-06-11-emacs-modus-themes-4-8-0/>.

(cherry picked from commit 7416595e2fc0ff676ef98a139328722ac9220ca0)