Code coverage in CI gets cancelled #40

When run on Windows, the code coverage workflow fails because running the tests fails (this is issue #3).

But when run on ubuntu-latest and macos-latest, the workflows get consistently cancelled before they finish running.
See e.g.:

• https://github.com/uutils/diffutils/actions/runs/8501415085/job/23284308320 where the grcov ~ install step gets cancelled
• https://github.com/uutils/diffutils/actions/runs/8501415085/job/23284308412 where the Test step gets cancelled