Upgrade GitHub actions to nodejs 20

Author: manuelbl

.github/workflows/continuous-integration.yaml

@@ -24,7 +24,7 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Setup Java
         uses: oracle-actions/setup-java@v1
         with:
@@ -33,6 +33,8 @@ jobs:
           version: latest
       - name: Configure GPG key
         run: |
+          gpg --version
+          echo "Encoded key length: ${#GPG_SIGNING_KEY}"
           echo -n "$GPG_SIGNING_KEY" | base64 --decode | gpg --import
         env:
           GPG_SIGNING_KEY: ${{ secrets.GPG_SIGNING_KEY }}

.github/workflows/test-devices.yaml

@@ -15,14 +15,14 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/cache@v3
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
         with:
           path: |
             ~/.cache/pip
             ~/.platformio/.cache
           key: ${{ runner.os }}-pio
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: '3.9'
       - name: Install PlatformIO Core