Backport: Fix ESP32-Solo WDT on HTTP OTA update (espressif#9223)

* Fix ESP32-Solo WDT on HTTP OTA update

* Fix ESP32-Solo WDT on HTTP OTA update

Author: Jason2866

cores/esp32/Esp.cpp

@@ -240,6 +240,10 @@ String EspClass::getSketchMD5()
         md5.add(buf.get(), readBytes);
         lengthLeft -= readBytes;
         offset += readBytes;
+
+        #if CONFIG_FREERTOS_UNICORE
+        delay(1);  // Fix solo WDT
+        #endif
     }
     md5.calculate();
     result = md5.toString();

libraries/Update/src/Updater.cpp

@@ -386,6 +386,10 @@ size_t UpdateClass::writeStream(Stream &data) {
         if((_bufferLen == remaining() || _bufferLen == SPI_FLASH_SEC_SIZE) && !_writeBuffer())
             return written;
         written += toRead;
+    
+        #if CONFIG_FREERTOS_UNICORE
+        delay(1);  // Fix solo WDT
+        #endif
     }
     return written;
 }