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Upgrade microsandbox to the official 0.7.8 release #1410

Job	Run time
plan	7s
distribution	56s
compose (ubuntu-24.04, amd64)	2m 26s
compose (ubuntu-24.04-arm, arm64)	2m 14s
harness	36s
web	48s
example	2m 21s
hygiene	9s
backend (integration 1/3)	2m 53s
backend (core)	3m 23s
backend (integration 2/3)	2m 21s
backend (integration 3/3)	2m 49s
backend (runtime)	2m 55s
website	32s
api / official-client	2m 13s
native / Core installer (macOS Intel)	1m 34s
lint / actionlint	7s
native / platform (darwin-arm64)	4m 29s
native / platform (linux-amd64)	2m 32s
native / platform (windows-amd64)	3m 29s
web-acceptance (1)	2m 33s
web-acceptance (2)	1m 4s
web-acceptance (4)	1m 37s
web-acceptance (3)	1m 38s
check	6s
	45m 52s