ci: fix main coverage badge generation #80

Job	Run time
Linting	10s
Installation (3.7)	1m 4s
Pytest (3.7)	1m 32s
Installation (3.8)	1m 34s
Installation (3.9)	1m 38s
Pytest (3.8)	1m 52s
Pytest (3.9)	1m 49s
Installation (3.10)	1m 31s
Pytest (3.10)	1m 57s
Installation (3.11)	1m 37s
Pytest (3.11)	1m 53s
Coverage / Update Base Coverage	9s
Coverage / Check Pull Request Coverage	0s
	16m 46s

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