chore: bootstrap pin 移到 2026.9.1.1 #1509

Job	Run time
build + unit tests (linux x86_64, self-host)	15m 34s
toolchain: musl + llvm	9m 24s
toolchain: gcc (cold self-host)	9m 27s
integration: mcpp builds & runs xlings	7m 4s
	41m 29s

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