Bump actions/upload-pages-artifact from 1 to 2 (#179) #274

Job	Run time
nix-flake-checks	3h 5m 40s
docker-based (alpine, deploy-image)	7m 46s
docker-based (archlinux)	6m 53s
docker-based (centos, no-tests)	4m 55s
docker-based (debian)	6m 11s
docker-based (debian-testing)	6m 29s
docker-based (debian-unstable)	5m 24s
docker-based (fedora)	5m 32s
docker-based (opensuse)	6m 22s
docker-based (oraclelinux)	6m 41s
docker-based (ubuntu)	6m 25s
docker-based (ubuntu-lts)	5m 57s
apt-based	45s
nix-based (with-nixpkgs)	1m 55s
nix-based (with-opam-nix)	8m 6s
opam-based (ubuntu, 4.11.x)	9m 36s
opam-based (ubuntu, 4.11.x, lower-bounds, no-doc)	14m 53s
opam-based (ubuntu, 4.12.x)	9m 29s
opam-based (ubuntu, 4.13.x)	11m 37s
opam-based (ubuntu, 4.14.x, lower-bounds, no-doc)	14m 16s
opam-based (ubuntu, 4.14.x, deploy-doc)	9m 55s
opam-based (ubuntu, 4.14.1, bytecode)	12m 14s
opam-based (macos, 4.14.x)	20m 36s
opam-based (windows, 4.14.x, no-tests)	23m 17s
opam-based (ubuntu, 5.0.x)	11m 57s
	6h 42m 51s

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