misc-tests #1721

Job	Run time
Test using Treelite as a library, via CMake export (ubuntu-latest)	1m 33s
Test backward compatibility of serializers (macos-latest)	1m 47s
Test backward compatibility of serializers (ubuntu-latest)	1m 50s
Test Treelite with custom libpath	1m 37s
Test using Treelite as a library, via CMake export (macos-latest)	1m 26s
Test sdist	2m 10s
	10m 23s

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