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ci: workspace mcpp bootstrap pin -> 2026.9.12.2 (#620) #1628

Job	Run time
e2e 1/2 (linux x86_64, self-host)	16m 29s
hermetic e2e (no host toolchain, container)	5m 34s
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	5m 50s
e2e 2/2 (linux x86_64, self-host)	15m 19s
	43m 12s