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ci/release: pin rivet to e8e4079e (main's release-0.6.0 commit, local… #190

Job	Run time
Contract preflight (i18n + release metadata)	5s
Windows host (WinRT build)	3m 24s
Linux host (GTK4 build)	7m 36s
Racket core (contract tests)	1m 26s
macOS host (arm64 build)	5m 5s
macOS host (x64 build)	6m 58s
	24m 34s