Update modus-themes to their version 4.3.0

Update modus-themes to their version 4.3.0

* doc/misc/modus-themes.org
(Option for reloading the theme on custom change)
(Option for disabling other themes while loading Modus)
(Option for completion framework aesthetics)
(Option for org-mode block styles, Get a single color from the palette)
(Add padding to mode line, Note on SHR fonts)
(Note on goto-address-mode faces): Use correct markup for 'nil'.
(Custom Org todo keyword and priority faces): Reword statements and
update the value of sample configuration blocks.
(Use more spacious margins or padding in Emacs frames): Mention the
'spacious-padding' package on GNU ELPA.
(Full support for packages or face groups): Document newly supported
packages and remove those that are no longer covered explicitly.
(Indirectly covered packages): Note that css-mode is covered
indirectly.
(Acknowledgements): Expand list of people who have helped with the
project.

* etc/themes/modus-operandi-deuteranopia-theme.el (unless): Add
theme-autoload cookie and relevant metadata.
(modus-operandi-deuteranopia): Expand or tweak the palette, where
necessary.

* etc/themes/modus-operandi-theme.el (unless): Add theme-autoload
cookie and relevant metadata.
(modus-operandi): Expand or tweak the palette, where necessary.
* etc/themes/modus-operandi-tinted-theme.el (unless): Add
theme-autoload cookie and relevant metadata.
(modus-operandi-tinted): Expand or tweak the palette, where necessary.

* etc/themes/modus-operandi-tritanopia-theme.el (unless): Add
theme-autoload cookie and relevant metadata.
(modus-operandi-tritanopia): Expand or tweak the palette, where
necessary.

* etc/themes/modus-vivendi-deuteranopia-theme.el (unless): Add
theme-autoload cookie and relevant metadata.
(modus-vivendi-deuteranopia): Expand or tweak the palette, where
necessary.

* etc/themes/modus-vivendi-theme.el (unless): Add theme-autoload
cookie and relevant metadata.
(modus-vivendi): Expand or tweak the palette, where necessary.

* etc/themes/modus-vivendi-tinted-theme.el (unless): Add
theme-autoload cookie and relevant metadata.
(modus-vivendi-tinted): Expand or tweak the palette, where necessary.

* etc/themes/modus-vivendi-tritanopia-theme.el (unless): Add
theme-autoload cookie and relevant metadata.
(modus-vivendi-tritanopia): Expand or tweak the palette, where
necessary.

* etc/themes/modus-themes.el (modus-themes-preset-overrides-faint)
(modus-themes-preset-overrides-intense)
(modus-themes-preset-overrides-warmer): Make minor tweaks.
(modus-themes--annotate-theme, modus-themes--select-prompt)
(modus-themes--toggle-theme-p, modus-themes-toggle)
(modus-themes--list-colors-prompt, modus-themes--heading)
(modus-themes-faces): Refine internal functions.

The detailed release notes are available here:
<https://protesilaos.com/codelog/2023-09-19-modus-themes-4-3-0/>.