Fix/suppress PMD CompareObjectsWithEquals findings (#11476)

Newer PMD versions discover more CompareObjectsWithEquals findings.

Related to https://github.com/openhab/static-code-analysis/pull/423

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.binding.dsmr/src/main/java/org/openhab/binding/dsmr/internal/device/DSMRSerialAutoDevice.java

@@ -223,6 +223,7 @@ public class DSMRSerialAutoDevice implements DSMRDevice, DSMREventListener {
     /**
      * Switches the baudrate on the serial port.
      */
+    @SuppressWarnings("PMD.CompareObjectsWithEquals")
     private void switchBaudrate() {
         if (lastSwitchedBaudrateNanos + SWITCHING_BAUDRATE_TIMEOUT_NANOS > System.nanoTime()) {
             // Ignore switching baudrate if this is called within the timeout after a previous switch.