Bump fregante/setup-git-user from 1 to 2 #46

Job	Run time
prepare / build-docker-image	35s
package / Compile (clang)	26m 32s
format / format	3m 59s
package / Compile (gcc)	26m 9s
lint / lint	10m 9s
tests / install-and-test (Arch Linux, archlinux:base-devel)	26s
tests / install-and-test (Debian, debian:stable)	17s
tests / install-and-test (Fedora, fedora:latest)	15s
	1h 8m 22s

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