test: drop 0.18.0 from upgrade tests, add 0.19.1 — radicle-ci-broker

Signed-off-by: Lars Wirzenius liw@liw.fi

 given a directory reports
 when I touch file run-list.txt
 when I run ./env.sh bash -x verify-upgrade run-list.txt 3b71380d86a4eeb4891272b6ca8a13b028bf6ab8
 when I run ./env.sh bash -x verify-upgrade run-list.txt 2f56e46398f03ab88d3de94de1c65c3c309a673c
 when I run ./env.sh bash -x verify-upgrade run-list.txt df22a8e11a4b8860da94862089cb681856fb0d07
 when I run ./env.sh bash -x verify-upgrade run-list.txt HEAD
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