Task 104881138061

guix: Update time-machine to `60f6956aeffa7f30285745bd0ea615e9acfc74f8`

2026-09-16 16:25:28 completed 260912-guix-riscv f01ae8a975be4f2489ebf8297a5b9451b8c8574a

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[meta] record frozen commit

260912-guix-riscv