Use gcc 11

Author: adazem009

.github/workflows/build.yml

@@ -30,6 +30,12 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev libgd-dev xvfb libxcb-cursor0
+    - name: Install GCC11
+      shell: bash
+      run:  |
+        sudo apt update
+        sudo apt install gcc-11 g++-11
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 110 --slave /usr/bin/g++ g++ /usr/bin/g++-11 --slave /usr/bin/gcov gcov /usr/bin/gcov-11
       shell: bash
     - name: Install Qt
       uses: jurplel/install-qt-action@v4

.github/workflows/utests.yml

@@ -31,6 +31,12 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y nlohmann-json3-dev libutfcpp-dev libgd-dev xvfb libxcb-cursor0
       shell: bash
+    - name: Install GCC11
+      shell: bash
+      run:  |
+        sudo apt update
+        sudo apt install gcc-11 g++-11
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 110 --slave /usr/bin/g++ g++ /usr/bin/g++-11 --slave /usr/bin/gcov gcov /usr/bin/gcov-11
     - name: Install Qt
       uses: jurplel/install-qt-action@v4
       with: