Draft: community/mate-{applets,calc,indicator-applet,power-manager,screensaver}: upgrade to 1.28

https://mate-desktop.org/blog/2024-02-27-mate-1-28-released/

The packages are part of the mate-desktop-environment metapackage.
As they are maintained by the same person, they have been grouped in one MR separate from other mate-* packages for easier review.

Edit: waiting for !68751 (merged), and for mate-desktop 1.28.2 riscv64 package to propagate and retry CI job for the arch.