Automatic toolchain upgrade improvements #150

Job	Run time
benchcomp-tests	8m 13s
regression (macos-11)	40m 51s
regression (ubuntu-20.04)	39m 33s
regression (ubuntu-22.04)	37m 33s
perf	48m 40s
bookrunner	38m 10s
releasebundle-macos (macos-11)	10m 40s
releasebundle-ubuntu	29m 55s
write-json-symtab-regression	19m 16s
	4h 32m 51s

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