Automatic library update

[github-actions]

The following libraries shall be updated:

• libpng: 1.6.47 → 1.6.48
• harfbuzz: 10.4.0 → 11.2.1
• pixman: 0.44.2 → 0.46.0
• expat: 2.7.0 → 2.7.1
• libxmp-lite: 4.6.2 → 4.6.3
• fluidsynth: 2.4.3 → 2.4.6
• nlohmannjson: 3.11.3 → 3.12.0
• fmt: 11.1.4 → 11.2.0
• inih: 58 → 60
• ICU: 76-1 → 77-1
• icudata: 76-1 → 77-1
• SDL2: 2.32.2 → 2.32.6

This pull request will adapt to changes made in the repository.
See also: https://github.com/EasyRPG/buildscripts/actions/runs/15216801978

[Ghabry]

I would prefer to only pick the expat and postpone the ICU update post release as their code likes to break on our homebrew systems and I don't want to retest (mutex issues).

[carstene1ns]

Expat is least invasive, since only used on desktop platforms.
So, let's go.

[Ghabry]

looks like the next version of fluidsynth will have an abstraction layer to get rid of glib 🥳 . Looks like -Dosal=embedded will provide a non-threadsafe abstraction of all the glib stuff which should be good enough for us...

[Ghabry]

Only had to update the fluidsynth patch and a fix for CMake 4.0 which removed support for old CMake versions.

Player built fine locally