Update runtime to a supported version

[yakushabb]

Copy of: flathub/com.github.theironrobin.siglo#4

This application relies on an outdated runtime that was marked as end-of-life (EOL) two years ago.

We are marking abandoned apps as EOL.

Please consider updating to a supported version.

Thanks.

LC_ALL=C flatpak remote-info flathub --system org.gnome.Platform//44
End-of-life: The GNOME 44 runtime is no longer supported as of March 20, 2024. 
Date: 2024-04-26 23:52:04 +0000