Add c++ package versions

Author: HerrNamenlos123

.github/actions/build-package/action.yaml

@@ -18,7 +18,7 @@ runs:
     - name: Install additional packages
       if: matrix.cfg.os == 'ubuntu-20.04'
       shell: bash
-      run: sudo apt update && sudo apt install -y gcc-9 gcc-9-arm-linux-gnueabihf gcc-9-aarch64-linux-gnu clang-10
+      run: sudo apt update && sudo apt install -y gcc-9 g++-9 gcc-9-arm-linux-gnueabihf g++-9-arm-linux-gnueabihf gcc-9-aarch64-linux-gnu g++-9-aarch64-linux-gnu clang-10
 
     - name: Install Python deps
       shell: bash