pull NormalGames submodule

I hope this fixes the uninstalled dependency in the runtests action

Author: brunompacheco

.github/workflows/tests.yml

@@ -24,6 +24,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive  # Pull the NormalGames.jl package (unregistered)
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.julia-version }}