Update toolchain to `nightly-2023-11-21` (#2890) #198

Job	Run time
bookrunner	15m 57s
benchcomp-tests	4m 14s
regression (macos-12)	31m 5s
regression (ubuntu-20.04)	21m 1s
perf	26m 34s
write-json-symtab-regression	12m 16s
regression (ubuntu-22.04)	23m 2s
	2h 14m 9s

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