Current support of rp2040 4.2.0

Author: marcel-licence

.github/workflows/compile-sketch.yml

@@ -208,6 +208,7 @@ jobs:
           platforms: |
             - name: rp2040:rp2040
               source-url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+              version: 4.2.0
           sketch-paths: ${{ matrix.sketch-paths }}
           libraries: |
               - source-url: https://github.com/marcel-licence/ML_SynthTools.git