v0.2.1

• Remove codecov as a dependency since it's been pulled from pypi (scverse/cookiecutter-scverse#161)
• Remove usage of deprecated GitHub actions environment variables (these will be removed in a month) (scverse/cookiecutter-scverse#161)
• Fix some spurious ruff errors (scverse/cookiecutter-scverse#156, scverse/cookiecutter-scverse#159)
• Replace the example citation with the scverse manuscript (scverse/cookiecutter-scverse#160)
• automatically cancel running CI jobs on new commit ( scverse/cookiecutter-scverse#158)