Bump fregante/setup-git-user from 1 to 2 (#42) #47

Job	Run time
prepare / build-docker-image	26s
format / format	3m 56s
package / Compile (clang)	26m 33s
package / Compile (gcc)	26m 40s
lint / lint	10m 12s
tests / install-and-test (Arch Linux, archlinux:base-devel)	23s
tests / install-and-test (Debian, debian:stable)	16s
tests / install-and-test (Fedora, fedora:latest)	24s
	1h 8m 50s

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