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ci: workspace mcpp bootstrap pin -> 0.0.106 (released + indexed) #551

Job	Run time
toolchain: musl + llvm	4m 29s
toolchain: gcc (cold self-host)	5m 32s
build + unit tests (linux x86_64, self-host)	6m 47s
integration: mcpp builds & runs xlings	6m 17s
	23m 5s