Update compile-sketch.yml

Author: marcel-licence

.github/workflows/compile-sketch.yml

@@ -123,7 +123,7 @@ jobs:
           platforms: |
             - name: STMicroelectronics:stm32
             - source-url: https://raw.githubusercontent.com/stm32duino/BoardManagerFiles/main/package_stmicroelectronics_index.json
-              version: 2.6.0
+              version: 2.0.0
           sketch-paths: |
             - examples/ml_mod_tracker
             - examples/ml_synth_organ_example