fixing setuptools_scm version distance calc

Author: slayoo

.github/workflows/tests+artifacts+pypi.yml

@@ -52,6 +52,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: recursive
+          fetch-depth: 0  # https://github.com/pypa/setuptools_scm/issues/480
 
       - uses: actions/setup-python@v1
         with: