ci: bump minimal rocq version and improve ci #3943

Job	Run time
nix	2m 10s
quick-build (dev, ubuntu-latest)	3m 17s
build (9.0)	3m 16s
opam-build (9.1, ubuntu-latest)	4m 21s
build (dev, --warnings)	3m 57s
quick-build (9.1, ubuntu-latest)	3m 12s
opam-build (9.0, ubuntu-latest)	4m 10s
opam-build (dev, ubuntu-latest)	4m 13s
build (9.1)	3m 19s
quick-build (9.0, ubuntu-latest)	3m 14s
doc-coqdoc	1m 36s
doc-timing	1m 34s
doc-dep-graphs	10m 16s
install (9.0)	1m 45s
coqchk (9.0)	1m 55s
install (dev)	1m 35s
doc-alectryon	12m 24s
install (9.1)	1m 47s
coqchk (dev)	1m 57s
coqchk (9.1)	1m 47s
deploy-doc	0s
delete-artifacts	6s
	1h 11m 51s

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