update flatpak-builder #1934

Job	Run time
Formatting Check	2m 28s
Flatpak	10m 35s
build (5.15.2, false, linux, ubuntu-latest, linux, linux, gcc_64, linux-x86_64, linux-x86-64, -DG...	10m 21s
build (5.15.2, false, macos, macos-latest, mac, mac, darwin64-x86_64-cc, 1)	10m 11s
build (5.15.2, false, win64, windows-latest, win, windows, win64_msvc2019_64, win64_msvc2017_64, ...	14m 47s
build (5.15.2, false, win32, windows-latest, win, windows, win32_msvc2019, win32_msvc2017, VC-WIN...	15m 12s
build (5.12.0, true, linux, ubuntu-latest, linux, linux, gcc_64, linux-x86_64, linux-x86-64, -DGE...	8m 36s
build (5.12.0, true, macos, macos-latest, mac, mac, darwin64-x86_64-cc, 1)	10m 59s
build (5.12.0, true, win64, windows-latest, win, windows, win64_msvc2019_64, win64_msvc2017_64, V...	14m 37s
build (5.12.0, true, win32, windows-latest, win, windows, win32_msvc2019, win32_msvc2017, VC-WIN3...	14m 56s
publish	0s
	1h 52m 42s

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