add missing pacman alias for suggested pre-reqs #6

Job	Run time
qa / eval-bash	15s
qa / sudo-not-required	13s
qa / usage-as-proxy	19s
qa / eval-zsh	22s
qa / install-pkgx (macos-latest)	8s
qa / eval-posix-sh	18s
qa / install-pkgx (ubuntu-latest)	14s
qa / no-dirs (/usr/local)	15s
qa / no-dirs (/usr/local/bin)	14s
qa / sudo-required	29s
qa / multiple-apply-is-ok	13s
qa / upgrades	15s
qa / linuxen (debian:buster-slim)	15s
qa / linuxen (debian:bullseye-slim)	17s
qa / linuxen (debian:bookworm-slim)	18s
qa / linuxen (archlinux:latest)	29s
qa / linuxen (ubuntu:focal)	17s
qa / linuxen (ubuntu:jammy)	17s
qa / linuxen (ubuntu:lunar)	24s
qa / linuxen (fedora:latest)	45s
put	7s
	6m 24s

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