Bump actions/upload-pages-artifact from 2 to 3 #297

Job	Run time
apt-based	42s
docker-based (alpine, deploy-image)	4m 18s
docker-based (archlinux)	3m 3s
docker-based (centos, no-tests)	3m 49s
docker-based (debian)	4m 11s
docker-based (debian-testing)	4m 13s
docker-based (debian-unstable)	4m 16s
docker-based (fedora)	4m 27s
docker-based (opensuse)	4m 35s
docker-based (oraclelinux)	4m 45s
docker-based (ubuntu)	4m 7s
docker-based (ubuntu-lts)	4m 9s
nix-based (with-nixpkgs)	1m 22s
nix-based (with-opam-nix)	1m 41s
nix-flake-checks	54s
opam-based (ubuntu, 4.11.x)	7m 36s
opam-based (ubuntu, 4.11.x, lower-bounds, no-doc)	8m 49s
opam-based (ubuntu, 4.12.x)	7m 17s
opam-based (ubuntu, 4.13.x)	7m 30s
opam-based (ubuntu, 4.14.x, lower-bounds, no-doc)	8m 29s
opam-based (ubuntu, 4.14.x, deploy-doc)	7m 11s
opam-based (ubuntu, 4.14.1, bytecode)	8m 37s
opam-based (macos, 4.14.x)	11m 46s
opam-based (windows, 4.14.x, no-tests)	13m 2s
opam-based (ubuntu, 5.0.x)	7m 38s
	2h 18m 27s

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