Simple fixes to the coverage Nox session

Author: DiddiLeija

noxfile.py

@@ -225,14 +225,14 @@ def pinned_requirements(path: Path) -> Iterator[Tuple[str, str]]:
 
 
 @nox.session
-def coverage(session: nox.Session):
+def coverage(session: nox.Session) -> None:
     if not os.path.exists("./.coverage-output"):
         os.mkdirs("./coverage-output")
     session.run(
         "pytest",
         "--cov=pip",
-        "--cov-config=./setup.cfg"
-        env={
+        "--cov-config=./setup.cfg",
+        env = {
             "COVERAGE_OUTPUT_DIR": "./coverage-output",
             "COVERAGE_PROCESS_START": "./setup.cfg",
         }