Update rust-pycobertura-action #620

Job	Run time
build (ubuntu-latest, stable)	52s
build (windows-latest, nightly)	1m 11s
build (ubuntu-latest, nightly)	37s
build (windows-latest, stable)	2m 20s
Code coverage	3s
Check version bump	8s
Publish crates on crates.io	1s
Create nightly	1s
Tag Release	1s
Check version bump	5s
Code coverage	1m 1s
build (ubuntu-latest, nightly)	37s
build (windows-latest, stable)	58s
build (windows-latest, nightly)	1m 11s
build (ubuntu-latest, stable)	52s
Publish crates on crates.io	1s
Create nightly	1s
Tag Release	1s
	10m 1s

Provide feedback