ci: bump minimal rocq version and improve ci #3942

Job	Run time
nix	2m 12s
build (9.1)	3m 24s
build (dev, --warnings)	3m 58s
build (9.0)	3m 26s
quick-build (9.1, ubuntu-latest)	3m 11s
quick-build (9.0, ubuntu-latest)	3m 15s
opam-build (9.1, ubuntu-latest)	4m 17s
opam-build (dev, ubuntu-latest)	4m 7s
opam-build (9.0, ubuntu-latest)	4m 18s
quick-build (dev, ubuntu-latest)	3m 0s
doc-dep-graphs	3m 29s
doc-coqdoc	1m 37s
doc-timing	1m 35s
doc-alectryon	3m 31s
coqchk (9.0)	1m 51s
coqchk (9.1)	1m 59s
install (9.0)	1m 34s
install (9.1)	1m 46s
install (dev)	1m 50s
coqchk (dev)	1m 56s
delete-artifacts	7s
deploy-doc	1s
	56m 24s

Provide feedback