CPP CI

Bump external/fmt from `2c0d9e9` to `b61c8c3` #227

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Run time

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Job	Run time
build_macos (Debug)	51s
build_windows (Debug)	1m 23s
build_ubuntu (Debug)	34s
build_macos (Release)	50s
build_windows (Release)	1m 42s
build_ubuntu (Release)	45s
	6m 5s