[thermopro_ble] Reduce heap allocation with stack-based string formatting (#12999)

esphome/components/thermopro_ble/thermopro_ble.cpp

@@ -47,7 +47,8 @@ bool ThermoProBLE::parse_device(const esp32_ble_tracker::ESPBTDevice &device) {
     return false;
   }
 
-  ESP_LOGVV(TAG, "parse_device(): MAC address %s found.", device.address_str().c_str());
+  char addr_buf[MAC_ADDRESS_PRETTY_BUFFER_SIZE];
+  ESP_LOGVV(TAG, "parse_device(): MAC address %s found.", device.address_str_to(addr_buf));
 
   // publish signal strength
   float signal_strength = float(device.get_rssi());