make OTA works for ESP32

[secmask]

it looks that telegramClient->find get blocking on ESP32, in my OTA update, it always cannot read getFile command properly, and result an error.

Type of change:

make block sendCommand read response like other parts.

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Testing:

• merged with the current development branch (before testing)
• CI build finished without issues
• Tested on real hardware (List board here): ESP32-C3, ESP8266
• Changes are backward compatible

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation