Automatic toolchain upgrade improvements #147

Job	Run time
benchcomp-tests	11m 49s
regression (macos-11)	41m 38s
regression (ubuntu-20.04)	33m 32s
regression (ubuntu-22.04)	45m 8s
write-json-symtab-regression	22m 36s
bookrunner	33m 10s
perf	43m 5s
releasebundle-macos (macos-11)	15m 19s
releasebundle-ubuntu	31m 6s
	4h 37m 23s

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