Update GitHub Actions to current versions

Co-authored-by: simonachmueller <3511513+simonachmueller@users.noreply.github.com>

Author: Copilot

.github/workflows/main.yml

@@ -8,19 +8,19 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with: 
         submodules: recursive
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v5
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install platformio
     - name: Run PlatformIO
       run: platformio run -e esp32dev
     - name: Archive build artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: firmware.bin
         path: .pio/build/esp32dev/firmware.bin