Update flake, fix pyrad build

The build fails for me with

      File "/nix/store/3wbw03q2z5d7ys1pzp30rmzn6qcxnyrp-python3.12-poetry-core-2.0.0/lib/python3.12/site-packages/poetry/core/masonry/metadata.py", line 112, in from_package
        if name == "repository" and url == package.urls["Repository"]:
                                           ~~~~~~~~~~~~^^^^^^^^^^^^^^
    KeyError: 'Repository'
    error: subprocess-exited-with-error

Making the `repository` key in the `urls` section of `pyproject.toml`
fixes the build.

There's a pending upstream PR doing the same: pyradius/pyrad#209

poetry2nix-python-overrides.nix

@@ -106,7 +106,8 @@ pkgs:
       pyrad = prev.pyrad.overrideAttrs (oA: {
         postPatch = ''
           substituteInPlace pyproject.toml \
-            --replace-fail "poetry.masonry.api" "poetry.core.masonry.api"
+            --replace-fail "poetry.masonry.api" "poetry.core.masonry.api" \
+            --replace-fail "repository =" "Repository ="
         '';
       });
      msgraph-sdk = prev.msgraph-sdk.overrideAttrs (oA: {