Replace `graph.load()` with `graph.parse()`

[eggplants]

fix: #186 I'll convert this into ready to merge after #184 is merged.

[eggplants]

Ran 1512 tests in 894.352s FAILED (failures=3, errors=211, skipped=549, expected failures=80)

I have to need to research this change's effect more.

[eggplants]

https://rdflib.readthedocs.io/en/stable/_modules/rdflib/graph.html#Graph.load

class Graph(Node):
...
    def load(self, source, publicID=None, format="xml"):
        warn(
            DeprecationWarning(
                "graph.load() is deprecated, it will be removed in rdflib 6.0.0. "
                "Please use graph.parse() instead."
            )
        )
        return self.parse(source, publicID, format)
...

[eggplants]

https://rdflib.readthedocs.io/en/stable/_modules/rdflib/graph.html#Graph.parse

class Graph(Node):
...
    def parse(
        self,
        source=None,
        publicID=None,
        format: Optional[str] = None,
        location=None,
        file=None,
        data: Optional[Union[str, bytes, bytearray]] = None,
        **args,
    ):
...

[eggplants]

I overlooked the fact that the default format is different in load ("xml") and parse (None).

[nicholascar]

Yes, default format used to be XML but now it's Turtle.