Pin micropython to v1.20.0

Author: mocleiri

.github/workflows/build_esp32.yml

@@ -1,6 +1,7 @@
 name: ESP32
 
 # https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#onschedule
+
 on:
   pull_request:
     paths:

scripts/build.sh

@@ -17,8 +17,8 @@ function prepare_dependencies {
     cd dependencies
 
     ULAB_VERSION=6.0.12
-    #MICRO_PYTHON_VERSION=v1.20.0
-    MICRO_PYTHON_VERSION=master
+    MICRO_PYTHON_VERSION=v1.20.0
+    #MICRO_PYTHON_VERSION=master
     MICROPYTHON_ESP32_CAMERA_DRIVER=master
     ESP32_TFLITE_VERSION=v1.0.0