chore(deps): update actions/download-artifact action to v4.2.1 (#4411) #12473

Job	Run time
build_details	6s
build_opam (4.14.x)	3m 42s
build_opam (5.3.x)	4m 44s
build_js	1m 25s
run_tests (@citest)	8m 22s
lezer_parse	41s
run_tests (@mediatest)	8m 37s
update_doc	7m 33s
build_no_depopts	3m 29s
build_win32 (x64)	11m 42s
run_tests (@doctest)	4m 35s
build_posix (debian_trixie, arm64)	9m 22s
build_posix (debian_bookworm, amd64)	8m 43s
tree_sitter_parse	1m 9s
build_posix (ubuntu_oracular, arm64)	9m 33s
build_posix (debian_trixie, amd64)	8m 38s
build_posix (debian_bookworm, arm64)	9m 37s
build_posix (ubuntu_noble, arm64)	9m 38s
build_posix (alpine, arm64)	6m 14s
build_posix (ubuntu_oracular, amd64)	8m 37s
build_posix (ubuntu_noble, amd64)	8m 51s
build_posix (alpine, amd64)	6m 8s
fetch_s3_artifacts	26s
build_docker (arm64)	1m 42s
build_docker_alpine (arm64)	48s
build_docker_alpine (amd64)	1m 1s
build_docker_alpine_minimal (amd64)	57s
build_docker_alpine_minimal (arm64)	45s
build_docker (amd64)	1m 36s
build_docker_minimal (amd64)	33s
build_docker_minimal (arm64)	1m 41s
update_release	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 30m 55s

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