fix(substrate): bump amd64 runsc default to gVisor nightly 2026-06-02… #823

Job	Run time
build (ui, ui)	38s
build (skills-init, skills-init)	1m 7s
build (golang-adk-full, golang-adk, -full)	2m 15s
build (golang-adk, golang-adk)	1m 49s
build (app, app)	2m 18s
build (controller, controller)	7m 27s
	15m 34s

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