ci: bootstrap pin moves to 2026.9.2.1 #1251

Job	Run time
e2e 2/2 (linux x86_64, self-host)	13m 15s
bare-metal e2e (riscv64-none-elf, qemu)	4m 25s
hermetic e2e (no host toolchain, container)	5m 45s
e2e 1/2 (linux x86_64, self-host)	12m 36s
	36m 1s

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