Update to latest nixpkgs-unstable, rustc #3501

Job	Run time
Firmware (universal, debuglink)	4m 14s
Firmware (btconly, debuglink)	4m 3s
Emulator (universal, debuglink, x86_64, noasan)	3m 31s
Emulator arm	0s
Emulator (btconly, debuglink, x86_64, noasan)	3m 37s
Post comment with UI diff URLs	5s
Device test (universal, noasan)	7m 37s
Upgrade test (noasan)	4m 58s
Device test (btconly, noasan)	4m 35s
Upload emulator binaries	0s
HWI test	0s
UI diff from main branch	2m 43s
	35m 23s

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