Address warnings produced by pydantic 2.x in tests

[danielballan]

#695 got the tests passing with pydantc 2.x, but running pytest generates many warnings showing that the current usage includes some deprecated patterns.

$ pytest v
<snipped>
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/main.py:1306
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/main.py:1306
  /home/dallan/mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/main.py:1306: PydanticDeprecatedSince20: The `update_forward_refs` method is deprecated; use `model_rebuild` instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.6/migration/
    warnings.warn(

../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272
  /home/dallan/mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/_internal/_config.py:272: PydanticDeprecatedSince20: Support for class-based `config` is deprecated, use ConfigDict instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.6/migration/
    warnings.warn(DEPRECATION_MESSAGE, DeprecationWarning)

../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/fields.py:754
../../../mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/fields.py:754
  /home/dallan/mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/fields.py:754: PydanticDeprecatedSince20: Using extra keyword arguments on `Field` is deprecated and will be removed. Use `json_schema_extra` instead. (Extra keys: 'example'). Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.6/migration/
    warn(

tiled/_tests/test_access_control.py: 76 warnings
tiled/_tests/test_allow_origins.py: 2 warnings
tiled/_tests/test_array.py: 84 warnings
tiled/_tests/test_asset_access.py: 40 warnings
tiled/_tests/test_authentication.py: 111 warnings
tiled/_tests/test_awkward.py: 36 warnings
tiled/_tests/test_catalog.py: 56 warnings
tiled/_tests/test_client.py: 50 warnings
tiled/_tests/test_client_cache.py: 64 warnings
tiled/_tests/test_compression.py: 2 warnings
tiled/_tests/test_config.py: 76 warnings
tiled/_tests/test_container_fields.py: 51 warnings
tiled/_tests/test_container_files.py: 52 warnings
tiled/_tests/test_custom_format.py: 7 warnings
tiled/_tests/test_dataframe.py: 37 warnings
tiled/_tests/test_decoders.py: 6 warnings
tiled/_tests/test_directory_walker.py: 110 warnings
tiled/_tests/test_distinct.py: 7 warnings
tiled/_tests/test_export.py: 20 warnings
tiled/_tests/test_hdf5.py: 21 warnings
tiled/_tests/test_history.py: 3 warnings
tiled/_tests/test_import_object.py: 2 warnings
tiled/_tests/test_indexers.py: 38 warnings
tiled/_tests/test_inlined_contents.py: 22 warnings
tiled/_tests/test_metrics.py: 6 warnings
tiled/_tests/test_object_cache.py: 23 warnings
tiled/_tests/test_openapi.py: 1 warning
tiled/_tests/test_queries.py: 221 warnings
tiled/_tests/test_search.py: 102 warnings
tiled/_tests/test_size_limit.py: 10 warnings
tiled/_tests/test_sort.py: 18 warnings
tiled/_tests/test_sparse.py: 4 warnings
tiled/_tests/test_specs.py: 6 warnings
tiled/_tests/test_structured_array.py: 3 warnings
tiled/_tests/test_tiff.py: 54 warnings
tiled/_tests/test_validation.py: 22 warnings
tiled/_tests/test_writing.py: 168 warnings
tiled/_tests/test_xarray.py: 27 warnings
  /home/dallan/mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/main.py:1024: PydanticDeprecatedSince20: The `dict` method is deprecated; use `model_dump` instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.6/migration/
    warnings.warn('The `dict` method is deprecated; use `model_dump` instead.', category=PydanticDeprecatedSince20)

tiled/_tests/test_access_control.py: 2 warnings
tiled/_tests/test_authentication.py: 46 warnings
  /home/dallan/mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/main.py:1165: PydanticDeprecatedSince20: The `from_orm` method is deprecated; set `model_config['from_attributes']=True` and use `model_validate` instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.6/migration/
    warnings.warn(

tiled/_tests/test_catalog.py: 21 warnings
tiled/_tests/test_custom_format.py: 3 warnings
tiled/_tests/test_distinct.py: 4 warnings
tiled/_tests/test_queries.py: 62 warnings
tiled/_tests/test_validation.py: 14 warnings
tiled/_tests/test_writing.py: 171 warnings
  /home/dallan/mambaforge/envs/py311/lib/python3.11/site-packages/pydantic/main.py:1069: PydanticDeprecatedSince20: The `parse_obj` method is deprecated; use `model_validate` instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.6/migration/
    warnings.warn(