Ensure clean environment for coverage data

Author: BrianMichell

noxfile.py

@@ -180,7 +180,10 @@ def tests(session: Session) -> None:
             session.notify("coverage", posargs=[])
 
 
-@session(python=python_versions[0])
+
+# We must pass `--clear` due to different session options during pipeline runs
+# https://github.com/TGSAI/mdio-python/blob/3d01a6d8c93cabeaeff1829599327ae83c7d6593/.github/workflows/tests.yml#L123-L130
+@session(python=python_versions[0], venv_params=["--clear"])
 def coverage(session: Session) -> None:
     """Produce the coverage report."""
     args = session.posargs or ["report"]