ci: fix main coverage badge generation #82

Job	Run time
Linting	10s
Installation (3.7)	1m 13s
Installation (3.8)	1m 45s
Pytest (3.7)	1m 30s
Pytest (3.8)	2m 0s
Installation (3.9)	3m 50s
Pytest (3.9)	1m 48s
Installation (3.10)	1m 36s
Pytest (3.10)	2m 17s
Installation (3.11)	1m 37s
Pytest (3.11)	2m 3s
Coverage / Check Pull Request Coverage	0s
Coverage / Update Base Coverage	15s
	20m 4s

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