[CI] Update Nix toolbox #270

Job	Run time
coq	1m 2s
coq-elpi	1m 45s
hierarchy-builder	1m 37s
mathcomp-ssreflect	3m 39s
coquelicot	4m 8s
autosubst	3m 36s
mathcomp-fingroup	4m 10s
mathcomp-bigenough	3m 31s
mathcomp-finmap	3m 45s
QuickChick	4m 10s
relation-algebra	4m 28s
interval	2m 53s
mathcomp-algebra	3m 55s
mathcomp-solvable	5m 25s
multinomials	4m 42s
mathcomp-classical	5m 6s
mathcomp-reals	2m 39s
mathcomp-field	3m 41s
mathcomp-experimental-reals	2m 12s
mathcomp-reals-stdlib	1m 44s
mathcomp-real-closed	4m 45s
mathcomp-character	5m 8s
mathcomp-analysis	13m 2s
coqeal	3m 37s
mathcomp	3m 7s
odd-order	11m 9s
mathcomp-analysis-stdlib	2m 6s
	1h 51m 2s

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