Task 103595378483

guix: Update time-machine to `b35905695afd2e24c56e6950433dd4f571581873`

2026-09-12 17:50:56 completed 260912-guix-riscv 71d345cce0730d1cdc7918c46936d9be5aac01de

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[meta] record frozen commit

260912-guix-riscv