fix: use AnyUrl for comparisons

[gadomski]

This worked as-was in pydantic v2.9 but not in v2.10. I discovered b/c tests were broken in main with pydantic v2.10.4:

$ uv pip install pydantic==2.10.4 
Resolved 4 packages in 9ms
Uninstalled 2 packages in 7ms
Installed 2 packages in 3ms
 - pydantic==2.9.2
 + pydantic==2.10.4
 - pydantic-core==2.23.4
 + pydantic-core==2.27.2
$ pytest -q
-- >8 ---
FAILED tests/api/test_landing_page.py::test_landing_page_invalid_features[landing_page_core.json] - Failed: DID NOT RAISE <class 'pydantic_core._pydantic_core.ValidationError'>
FAILED tests/api/test_landing_page.py::test_landing_page_invalid_features[landing_page_ogcapi-features.json] - Failed: DID NOT RAISE <class 'pydantic_core._pydantic_core.ValidationError'>