fix: beam centre model instantiation

src/aare/beamline_dispatch/default/beamline_dispatch.py

@@ -22,8 +22,8 @@ class DefaultGeometry(Geometry):
     def __init__(self, beamline: MXBeamline) -> None:
         super().__init__()
         with open(files("aarecommon.config") / "beamline_configs" / "beam_centres.json") as f:
-            measurements = json.loads(f.read())[beamline.value.lower()]
-        self._model = BeamCentre.model_validate(measurements)
+            measured = json.loads(f.read())[beamline.value.lower()]
+        self._model = BeamCentre.model_validate(measured)
         self._beamline = beamline
 
     @property