Update python and pio commands

Author: h2zero

.github/workflows/examples.yml

@@ -8,7 +8,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: [3.9]
+        python-version: [3.12]
         example:
           - "examples/BLE-client-test"
           - "examples/BLE-server-test"
@@ -25,7 +25,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -U https://github.com/platformio/platformio/archive/develop.zip
-          platformio platform install file://.
+          pio pkg install --global --platform file://.
       - name: Build examples
         run: |
-          platformio run -d ${{ matrix.example }}
+          pio run -d ${{ matrix.example }}