Build

Bump dawidd6/action-download-artifact from 3 to 6 in /.github/workflows #933

Job	Run time
Windows MSYS2 x86_64 GCC	10m 53s
Windows MSYS2 i686 GCC	10m 6s
Windows MSYS2 x86_64 GCC without SDL	9m 59s
Linux GCC	4m 56s
Linux GCC SDL 1.2	4m 11s
Linux Clang	6m 13s
Linux Clang without GL	5m 43s
Linux Clang without Polymer	5m 55s
macOS Clang	4m 10s
	1h 2m 6s

Provide feedback