Update download-artifact to v4

Author: sebromero

.github/workflows/compile-examples.yml

@@ -80,7 +80,7 @@ jobs:
       - name: Download sketches reports artifact
         id: download-artifact
         continue-on-error: true # If compilation failed for all boards then there are no artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: ${{ env.SKETCHES_REPORTS_ARTIFACT_NAME }}
           path: ${{ env.SKETCHES_REPORTS_PATH }}