test: mark SPARQLStore class docstring as webtest

Author: edmondchuc

test/conftest.py

@@ -97,6 +97,7 @@ def exit_stack() -> Generator[ExitStack, None, None]:
  ("rdflib/__init__.py", "rdflib"): [pytest.mark.webtest],
  ("rdflib/term.py", "rdflib.term.Literal.normalize"): [pytest.mark.webtest],
  ("rdflib/extras/infixowl.py", "rdflib.extras.infixowl"): [pytest.mark.webtest],
+ ("rdflib/plugins/stores/sparqlstore.py", "SPARQLStore"): [pytest.mark.webtest],
 }