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feat: upgrade toolchain to nightly-2025-12-12 #287

Job	Run time
rustfmt	29s
clippy (x86_64, x86_64-unknown-none)	1m 13s
clippy (loongarch64, loongarch64-unknown-none-softfloat)	1m 11s
clippy (riscv64, riscv64gc-unknown-none-elf)	1m 21s
clippy (aarch64, aarch64-unknown-none-softfloat)	1m 14s
	5m 28s

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