github actions: fix installation after move to ubuntu 24.04

The default github action image moved from ubuntu 22.04 to 24.04, and
its list of installed packages is not the same. Make sure we have
libcairo for pycairo.

.github/workflows/python-check.yml

@@ -24,6 +24,9 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: ${{ env.PR_FETCH_DEPTH }}
 
+      - name: install cairo so we can install hwgraph dependencies
+        run: sudo apt update && sudo apt install libcairo2
+
       - name: Install uv
         uses: astral-sh/setup-uv@v3
         with: