Add missing trailing slash for codecov #212

Job	Run time
get_version	5s
build-and-run-tests-ubuntu	33m 55s
build-and-run-tests-windows	58m 50s
build-and-run-tests-macos (macos-14)	42m 55s
build-and-run-tests-macos (macos-15-intel)	55m 49s
	3h 11m 34s

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