[CI] Add Coq 9.0+rc1 #601

Job	Run time
coq	1m 7s
stdlib	1m 1s
coq-elpi	1m 38s
hierarchy-builder	1m 33s
mathcomp-ssreflect	3m 8s
mathcomp-bigenough	1m 29s
mathcomp-fingroup	2m 1s
mathcomp-finmap	1m 38s
mathcomp-algebra	4m 17s
mathcomp-solvable	4m 47s
mathcomp-classical	5m 12s
multinomials	4m 24s
mathcomp-field	3m 35s
mathcomp-reals	2m 17s
mathcomp-experimental-reals	1m 59s
mathcomp-reals-stdlib	1m 2s
mathcomp-analysis	11m 36s
mathcomp-character	4m 22s
mathcomp-real-closed	4m 18s
mathcomp	1m 45s
odd-order	9m 19s
mathcomp-analysis-stdlib	9m 29s
	1h 21m 57s

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