ci: fixed codecov upload #111

Job	Run time
Lint	19s
Unit tests (ubuntu-latest, oldstable)	27s
Unit tests (macos-latest, oldstable)	39s
Unit tests (windows-latest, stable)	1m 26s
Unit tests (windows-latest, oldstable)	3m 3s
Unit tests (macos-latest, stable)	37s
Unit tests (ubuntu-latest, stable)	37s
	7m 8s

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