ci: pin mcpp 2026.8.25.1 (#10) #86

Job	Run time
cross-link for the other system, from this one	2m 38s
macos, llvm	1m 18s
linux, llvm	2m 9s
linux, gcc	1m 52s
windows, gcc	4m 22s
what was cross-built starts, on that system	8s
	12m 27s

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