workflows/poetry: aggregate coverage over all Python versions #116
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Summary
The parallel CI jobs across different Python versions cause issues with the coverage report submission (see e.g. this job).
This patch configures the workflow as a parallel build to the Coveralls app. This aggregates the coverage from all jobs to the final coverage value reported e.g. to the badge. This is relevant, since some examples cannot be run on all Python versions (due to the lack of wheels for recent Python versions).