[CI] Add Coq 9.0+rc1 #346

Job	Run time
coq	1m 1s
coq-elpi	1m 49s
hierarchy-builder	1m 34s
mathcomp-ssreflect	3m 40s
coquelicot	4m 17s
QuickChick	4m 5s
autosubst	3m 36s
mathcomp-bigenough	3m 30s
mathcomp-fingroup	4m 12s
mathcomp-finmap	3m 50s
relation-algebra	4m 43s
mathcomp-algebra	4m 2s
interval	2m 58s
mathcomp-classical	5m 43s
multinomials	4m 50s
mathcomp-solvable	5m 35s
mathcomp-field	5m 20s
mathcomp-reals	2m 40s
mathcomp-experimental-reals	2m 17s
mathcomp-reals-stdlib	1m 49s
mathcomp-real-closed	6m 10s
mathcomp-character	5m 7s
mathcomp-analysis	12m 56s
mathcomp	3m 18s
coqeal	57s
odd-order	11m 33s
mathcomp-analysis-stdlib	10m 57s
	2h 2m 29s

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