Update to latest nixpkgs-unstable, rustc #3576

Job	Run time
Emulator (universal, debuglink, x86_64, noasan)	3m 53s
Firmware (universal, debuglink)	3m 59s
Emulator (btconly, debuglink, x86_64, noasan)	3m 18s
Firmware (btconly, debuglink)	3m 54s
Post comment with UI diff URLs	5s
Emulator arm	0s
Upgrade test (noasan)	4m 16s
Device test (universal, noasan)	7m 42s
HWI test	0s
Device test (btconly, noasan)	4m 42s
Upload emulator binaries	0s
UI diff from main branch	2m 29s
	34m 18s

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