Add littlefs-python package for ESP32 target

.github/workflows/main_matrix.yml

@@ -119,7 +119,7 @@ jobs:
     - name: Upgrade python tools
       run: |
         python -m pip install --upgrade pip
-        pip install -U platformio meshtastic adafruit-nrfutil
+        pip install -U platformio meshtastic adafruit-nrfutil littlefs-python
 
     - name: Upgrade platformio
       run: |