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ci: workspace mcpp bootstrap pin -> 2026.9.8.1 (released + indexed) #1501

Job	Run time
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	1m 18s
hermetic e2e (no host toolchain, container)	1m 7s
e2e 1/2 (linux x86_64, self-host)	1m 18s
e2e 2/2 (linux x86_64, self-host)	1m 18s
	5m 1s