[CI] Update Nix toolbox #727

Job	Run time
coq	1m 5s
coq-elpi-tests	1m 49s
stdlib	1m 3s
coq-elpi	1m 46s
bignums	1m 4s
coq-elpi-tests-stdlib	1m 31s
hierarchy-builder	1m 29s
mathcomp-ssreflect	3m 12s
mathcomp-bigenough	3m 3s
mathcomp-fingroup	3m 32s
mathcomp-finmap	3m 22s
mathcomp-algebra	5m 58s
mathcomp-solvable	4m 38s
multinomials	4m 35s
mathcomp-classical	5m 1s
mathcomp-field	3m 29s
mathcomp-reals	3m 32s
mathcomp-real-closed	4m 24s
mathcomp-character	4m 32s
mathcomp-experimental-reals	2m 4s
mathcomp-analysis	10m 16s
mathcomp-reals-stdlib	1m 51s
coqeal	3m 41s
mathcomp	2m 48s
odd-order	9m 9s
mathcomp-analysis-stdlib	10m 39s
	1h 39m 33s

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