bekkalokk: source map data from the new map data impl in python

.gitea/workflows/eval.yml

@@ -8,6 +8,6 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - run: apt-get update && apt-get -y install sudo
-    - uses: https://github.com/cachix/install-nix-action@v31
+    - uses: https://github.com/cachix/install-nix-action@v23
     - run: echo -e "show-trace = true\nmax-jobs = auto\ntrusted-users = root\nexperimental-features = nix-command flakes\nbuild-users-group =" > /etc/nix/nix.conf
     - run: nix flake check