fix: typing in dispatch

src/aare/beamline_dispatch/default/beamline_dispatch.py

@@ -1,5 +1,6 @@
 import json
 import os
+from abc import ABC
 from importlib.resources import files
 
 from aarecommon.config.beamline import MXBeamline
@@ -21,7 +22,7 @@ class DefaultAuthDispatch(AuthDispatch):
 class DefaultGeometry(Geometry):
     def __init__(self, beamline: MXBeamline) -> None:
         super().__init__()
-        with open(files("aarecommon.config") / "beamline_configs" / "beam_centres.json") as f:
+        with open(str(files("aarecommon.config") / "beamline_configs" / "beam_centres.json")) as f:
             measured = json.loads(f.read())[beamline.value.lower()]
         self._model = BeamCentre.model_validate(measured)
         self._beamline = beamline
@@ -31,7 +32,7 @@ class DefaultGeometry(Geometry):
         return self._model.model
 
 
-class DefaultDispatch(BeamlineDispatch):
+class DefaultDispatch(BeamlineDispatch, ABC):
     """Default implementation for anything which can vary between beamlines and/or simulation.
     Should be safe and fail rather than assuming anything."""