Update linux.yml

Workaround for bug in Mesa

Author: HelioGuilherme66

.github/workflows/linux.yml

@@ -77,6 +77,7 @@ jobs:
     - name: Setup environment
       run: |
         sudo dnf install -y sdl12-compat python3-wxpython4 xorg-x11-server-Xvfb python3-pip psmisc
+        sudo dnf downgrade mesa* --refresh
         sudo -H pip install -r requirements-dev.txt
     - name: Run tests
       run: |