Remove pkg-config installation from CI workflow

Author: cclauss

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-26.04
     steps:
       - run: sudo apt-get update
-      - run: sudo apt-get install -y pkg-config lua5.1 liblua5.1-0-dev
+      - run: sudo apt-get install -y lua5.1 liblua5.1-0-dev
       - run: lua -h || lua -v
       - uses: actions/checkout@v6
       - uses: actions/setup-python@v6