Automatic toolchain upgrade to nightly-2023-10-20 (#2838) #5568

Job	Run time
benchcomp-tests	5m 29s
write-json-symtab-regression	21m 3s
perf	46m 35s
regression (macos-12)	38m 52s
bookrunner	31m 57s
releasebundle-macos (macos-12)	13m 53s
regression (ubuntu-20.04)	40m 5s
regression (ubuntu-22.04)	32m 36s
releasebundle-ubuntu	37m 23s
	4h 27m 53s

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