test against Coq 8.8.0; update CI

7 jobs for master in 18 minutes and 54 seconds (queued for 1 minute and 21 seconds)
Status Job ID Name Coverage
  Build
passed #10771
fp
build-coq.8.6.0

00:06:01

passed #10770
fp
build-coq.8.6.1

00:05:56

passed #10769
fp
build-coq.8.7.0

00:07:00

passed #10768
fp
build-coq.8.7.1

00:02:36

passed #10767
fp-timing
build-coq.8.7.2

00:02:46

passed #10766
fp
build-coq.8.8.0

00:08:56

passed #10765
fp
build-coq.dev

00:14:58