Bump runtime to 47

[flathubbot]

Started test build 151484

[flathubbot]

Build 151484 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/134573/io.github.celluloid_player.Celluloid.flatpakref

[TingPing]

Switch luajit to github tags as download link is 404

I was planning on just switching to lua, now that luajit gave up on releases. If you wouldn't mind doing this.

[flathubbot]

Started test build 151616

[bbhtt]

It only supports lua 5.1 and 5.2. 5.3+ is unsupported. Most people seems to be building with 5.1

[flathubbot]

Build 151616 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/134699/io.github.celluloid_player.Celluloid.flatpakref