chore: bump version to 2026.8.16.3 (#443) #1069

Job	Run time
build + unit tests (linux x86_64, self-host)	11m 2s
integration: mcpp builds & runs xlings	8m 24s
toolchain: gcc (cold self-host)	8m 5s
toolchain: musl + llvm	6m 8s
	33m 39s

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