chore: fix reporting on _typing

Signed-off-by: Henry Schreiner <[email protected]>

pyproject.toml

@@ -141,10 +141,10 @@ testpaths = [ "tests" ]
 
 [tool.coverage]
 run.branch = true
-run.omit = [ "nox/_typing.py" ]
 run.relative_files = true
 run.source_pkgs = [ "nox" ]
 report.exclude_also = [ "def __dir__()", "if TYPE_CHECKING:", "@overload" ]
+report.omit = [ "nox/_typing.py" ]
 
 [tool.mypy]
 files = [ "nox/**/*.py", "noxfile.py" ]