increase delay for Ethernet module warm up (#3326)

esphome/components/ota/ota_component.cpp

@@ -474,7 +474,7 @@ bool OTAComponent::should_enter_safe_mode(uint8_t num_attempts, uint32_t enable_
     });
 
     // Delay here to allow power to stabilise before Wi-Fi/Ethernet is initialised.
-    delay(100);  // NOLINT
+    delay(300);  // NOLINT
     App.setup();
 
     ESP_LOGI(TAG, "Waiting for OTA attempt.");