Remove more unnecessary methods

singer/bookmarks.py

@@ -24,11 +24,6 @@ def __eq__(self, other: Any) -> bool:
     def bookmarks(self) -> Dict:
         return self._bookmarks
 
-    @classmethod
-    def load(cls, filename: str) -> "State":
-        with open(filename) as fp:  # pylint: disable=invalid-name
-            return State.from_dict(json.load(fp))
-
     @classmethod
     def from_dict(cls, data: Dict) -> "State":
         return State(
@@ -42,9 +37,6 @@ def to_dict(self) -> Dict:
             state["currently_syncing"] = self.get_currently_syncing()
         return state
 
-    def dump(self) -> None:
-        json.dump(self.to_dict(), sys.stdout, indent=2)
-
     def _ensure_bookmark_path(self, path: Sequence) -> None:
         submap = self.bookmarks
         for path_component in path: