Fix windows errors

Author: benjeffery

.github/workflows/tests.yml

@@ -121,7 +121,7 @@ jobs:
           source ~/.profile
           conda activate anaconda-client-env
           if [[ "${{ matrix.os }}" == "windows-latest" ]]; then
-            python -m pytest -x --skip-slow --cov=tskit --cov=tskit.jit --cov-report=xml --cov-branch -n2 --durations=20 tests
+            python -m pytest -x --skip-slow --cov=tskit --cov-report=xml --cov-branch -n2 --durations=20 tests
           else
             python -m pytest -x --cov=tskit --cov-report=xml --cov-branch -n2 --durations=20 tests
           fi