Bump cachix/install-nix-action from 22 to 23 #281

Job	Run time
nix-based (with-nixpkgs)	1m 57s
docker-based (alpine, deploy-image)	5m 50s
nix-based (with-opam-nix)	8m 5s
opam-based (ubuntu, 4.11.x)	8m 7s
docker-based (archlinux)	5m 48s
opam-based (ubuntu, 4.11.x, lower-bounds, no-doc)	10m 56s
apt-based	43s
opam-based (ubuntu, 4.12.x)	8m 7s
nix-flake-checks	1h 33m 51s
docker-based (centos, no-tests)	5m 21s
opam-based (ubuntu, 4.13.x)	8m 32s
docker-based (debian)	5m 37s
opam-based (ubuntu, 4.14.x, lower-bounds, no-doc)	7m 45s
docker-based (debian-testing)	5m 50s
opam-based (ubuntu, 4.14.x, deploy-doc)	7m 45s
docker-based (debian-unstable)	5m 23s
opam-based (ubuntu, 4.14.1, bytecode)	10m 4s
docker-based (fedora)	7m 20s
opam-based (macos, 4.14.x)	12m 11s
docker-based (opensuse)	7m 4s
docker-based (oraclelinux)	6m 15s
opam-based (windows, 4.14.x, no-tests)	17m 24s
docker-based (ubuntu)	5m 30s
opam-based (ubuntu, 5.0.x)	8m 17s
docker-based (ubuntu-lts)	6m 29s
	4h 30m 11s

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