feat: bump to `@guidebooks/store@8` #1395

Job	Run time
kind (ubuntu-latest, 16.x, /bin/bash)	2m 40s
kind (ubuntu-latest, 16.x, /bin/zsh)	3m 23s
kind (macOS-latest, 16.x, /bin/bash)	3m 49s
kind (macOS-latest, 16.x, /bin/zsh)	4m 17s
kind (windows-latest, 16.x, /bin/bash)	8m 2s
kind (windows-latest, 16.x, /bin/zsh)	5m 22s
	27m 33s

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