FIX: Use modern CMake Version for Tests

.gitea/workflows/tests.yml

@@ -21,6 +21,12 @@ jobs:
             build-essential \
             libfreetype-dev \
             libgl1-mesa-dev
+          wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | \
+            gpg --dearmor - | sudo tee /usr/share/keyrings/kitware-archive-keyring.gpg >/dev/null
+          echo 'deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ jammy main' | \
+            sudo tee /etc/apt/sources.list.d/kitware.list >/dev/null
+          sudo apt-get update
+          sudo apt-get install -y cmake
 
       - name: Submodules laden
         run: git submodule update --init --recursive