Update rust-pycobertura-action #623

Job	Run time
Check version bump	7s
build (windows-latest, stable)	1m 47s
build (windows-latest, nightly)	1m 9s
build (ubuntu-latest, stable)	57s
build (ubuntu-latest, nightly)	37s
Code coverage	52s
Create nightly	0s
Publish crates on crates.io	0s
Tag Release	0s
	5m 29s

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