[infrastructure] move infered nullness warnings to error and update EEA (#8949)

Signed-off-by: Jan N. Klug <jan.n.klug@rub.de>

bundles/org.openhab.binding.lifx/src/main/java/org/openhab/binding/lifx/internal/handler/LifxLightHandler.java

@@ -636,6 +636,7 @@ public class LifxLightHandler extends BaseThingHandler {
                     .setTemperature(percentTypeToKelvin(localPowerOnTemperature, product.getTemperatureRange()));
         }
 
+        PercentType powerOnBrightness = this.powerOnBrightness;
         if (powerOnBrightness != null) {
             PercentType newBrightness = onOff == OnOffType.ON ? powerOnBrightness : new PercentType(0);
             getLightStateForCommand().setBrightness(newBrightness);