Update PlatformIO CI script

Author: valeros

.github/actions/pio-build/entrypoint.sh

@@ -8,7 +8,7 @@ platformio platform install "https://github.com/platformio/platform-ststm32.git"
   exit 1
 }
 # Prepare framework for CI
-python3 -c "import json; import os; fp=open(os.path.expanduser('~/.platformio/platforms/ststm32/platform.json'), 'r+'); data=json.load(fp); data['packages']['framework-arduinoststm32']['version'] = '*'; fp.seek(0); fp.truncate(); json.dump(data, fp); fp.close()" || {
+python3 -c "import json; import os; fp=open(os.path.expanduser('~/.platformio/platforms/ststm32/platform.json'), 'r+'); data=json.load(fp); data['packages']['framework-arduinoststm32']['version'] = '*'; del data['packages']['framework-arduinoststm32']['owner]; fp.seek(0); fp.truncate(); json.dump(data, fp); fp.close()" || {
   exit 1
 }
 ln --symbolic "$GITHUB_WORKSPACE" "$HOME/.platformio/packages/framework-arduinoststm32" || {