CPP CI

Bump external/fmt from `536cabd` to `df249d8` in the submodules group #300

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Run time

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Job	Run time
build_windows (Debug)	1m 22s
build_ubuntu (Debug)	29s
build_macos (Debug)	34s
build_windows (Release)	1m 30s
build_macos (Release)	50s
build_ubuntu (Release)	39s
	5m 24s