ci: workspace mcpp bootstrap pin -> 2026.8.11.3 (released, mirrored, … #648

Job	Run time
windows→linux cross-build (windows host)	8m 7s
mingw-cross linux→windows (build + wine run)	5m 37s
cross-build aarch64-linux-musl (mcpp + xlings)	7m 49s
windows→linux artefact really runs (linux)	6s
	21m 39s

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