ci: workspace mcpp bootstrap pin -> 2026.9.11.4 #1648

Job	Run time
windows→linux cross-build (windows host)	1m 26s
mingw-cross linux→windows (build + wine run)	1m 7s
cross-build aarch64-linux-musl (mcpp + xlings)	10m 22s
windows→linux artefact really runs (linux)	-1s
mingw-cross linux→windows (build + wine run)	7m 29s
windows→linux cross-build (windows host)	10m 4s
cross-build aarch64-linux-musl (mcpp + xlings)	10m 22s
windows→linux artefact really runs (linux)	5s
	40m 54s

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