fix: Use actions/upload-artifact@v4 (#96) #528

Job	Run time
coq_version / docker-coq / opam (8.18, default)	1m 23s
custom_image / docker-mathcomp / opam (mathcomp/mathcomp-dev:coq-dev)	1m 18s
coq_version / docker-coq / opam (latest-native, default)	1m 19s
custom_image / docker-coq / make / script (coqorg/coq:latest)	1m 19s
custom_image / docker-mathcomp / opam (mathcomp/mathcomp:latest-coq-8.19)	1m 10s
coq_version / docker-coq / opam (dev, default)	1m 21s
custom_image / docker-coq / make / script (coqorg/coq:dev)	1m 20s
custom_image / docker-coq / opam / auto install depexts (coqorg/coq:dev)	1m 21s
custom_image / docker-coq / opam / env (coqorg/coq:latest)	1m 19s
custom_image / docker-coq / opam / apt-get install more (coqorg/coq:latest)	1m 19s
custom_image / docker-coq / opam / apt-get install more (coqorg/coq:dev)	1m 20s
custom_image / docker-coq / opam+make / upload-artifacts (coqorg/coq:latest)	1m 21s
custom_image / docker-mathcomp / opam / env+GITHUB_ENV (mathcomp/mathcomp:latest-coq-8.19)	1m 11s
custom_image / docker-coq / make / custom_script (coqorg/coq:latest)	1m 21s
custom_image / docker-coq / make / custom_script (coqorg/coq:dev)	1m 19s
	19m 41s

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