Build using latest GCC version.

.github/workflows/build-linux.yaml

@@ -27,7 +27,7 @@ jobs:
     - name: Install Other Dependencies
       run: |
         sudo apt update
-        sudo apt install gcc-9 g++-9 libcurl4-openssl-dev libgl1-mesa-dev libglu1-mesa-dev libalut-dev libevdev-dev
+        sudo apt install libcurl4-openssl-dev libgl1-mesa-dev libglu1-mesa-dev libalut-dev libevdev-dev
         # The following packages are necessary for linuxdeployqt to work
         sudo apt install libfuse2 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-render-util0 libxcb-xinerama0
     - name: Checkout