Add missing trailing slash for codecov #57

Job	Run time
get_version	6s
build-and-run-tests-macos (macos-14)	22m 49s
build-and-run-tests-ubuntu	55m 26s
code-coverage-build-and-run-tests-ubuntu	53m 29s
build-and-run-tests-macos (macos-15-intel)	22m 29s
build-and-run-tests-windows	1h 35m 21s
build-and-run-tests-macos (macos-14)	1h 3m 35s
build-and-run-tests-windows	1h 36m 20s
build-and-run-tests-macos (macos-15-intel)	1h 23m 38s
build-and-run-tests-ubuntu	55m 26s
code-coverage-build-and-run-tests-ubuntu	53m 29s
get_version	6s
	10h 2m 14s

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