ci: workspace mcpp bootstrap pin -> 2026.8.11.3 (released, mirrored, … #888

Job	Run time
build + unit tests (linux x86_64, self-host)	15m 58s
toolchain: gcc (cold self-host)	8m 38s
toolchain: musl + llvm	6m 56s
integration: mcpp builds & runs xlings	7m 9s
	38m 41s

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