Increased debug message precision (#5496)

esphome/components/ultrasonic/ultrasonic_sensor.cpp

@@ -37,7 +37,7 @@ void UltrasonicSensorComponent::update() {
     this->publish_state(NAN);
   } else {
     float result = UltrasonicSensorComponent::us_to_m(pulse_end - pulse_start);
-    ESP_LOGD(TAG, "'%s' - Got distance: %.2f m", this->name_.c_str(), result);
+    ESP_LOGD(TAG, "'%s' - Got distance: %.3f m", this->name_.c_str(), result);
     this->publish_state(result);
   }
 }