fix: cached read from BEC client devices

src/aare/daq/devices.py

@@ -275,11 +275,11 @@ class BeamlineDevices:
     # Detector Z
     @property
     def dtz(self) -> float:
-        return self._dtz.user_setpoint.get()
+        return self._dtz.user_setpoint.get(cached=True)
 
     @property
     def dty(self) -> float:
-        return self._dty.user_setpoint.get()
+        return self._dty.user_setpoint.get(cached=True)
 
     @dtz.setter
     def dtz(self, value: float):

src/aare/devices/bec_worker.py

@@ -530,7 +530,7 @@ class BECClientWorker:
     @property
     def ring_current(self) -> float:
         try:
-            return self._ring_current.get()
+            return self._ring_current.get(cached=True)
         except (RPCError, ScanRequestError):
             return 0