fix: Add explicit extension generic parameter to User class

[vpatov]

Fixes #91

»  python -m pytest 
========================================================================== test session starts ==========================================================================
platform linux -- Python 3.10.12, pytest-8.3.5, pluggy-1.5.0
rootdir: /home/vpatov/coreweave/scim2-models
configfile: pyproject.toml
plugins: anyio-4.4.0
collected 96 items                                                                                                                                                      

doc/tutorial.rst .                                                                                                                                                [  1%]
tests/test_dynamic_resources.py .......                                                                                                                           [  8%]
tests/test_dynamic_schemas.py .......                                                                                                                             [ 15%]
tests/test_enterprise_user.py .                                                                                                                                   [ 16%]
tests/test_errors.py .                                                                                                                                            [ 17%]
tests/test_group.py .                                                                                                                                             [ 18%]
tests/test_list_response.py ............                                                                                                                          [ 31%]
tests/test_model_attributes.py .......                                                                                                                            [ 38%]
tests/test_model_serialization.py ...........                                                                                                                     [ 50%]
tests/test_model_validation.py ................                                                                                                                   [ 66%]
tests/test_models.py ....                                                                                                                                         [ 70%]
tests/test_patch_op.py .                                                                                                                                          [ 71%]
tests/test_resource_extension.py ..........                                                                                                                       [ 82%]
tests/test_resource_type.py ....                                                                                                                                  [ 86%]
tests/test_schema.py ....                                                                                                                                         [ 90%]
tests/test_search_request.py .....                                                                                                                                [ 95%]
tests/test_service_provider_configuration.py .                                                                                                                    [ 96%]
tests/test_user.py ..                                                                                                                                             [ 98%]
tests/test_utils.py .                                                                                                                                             [100%]

========================================================================== 96 passed in 2.56s ===========================================================================

[azmeuk]

Please fix the style issue, and then we are ready to merge.

[vpatov]

Fixed the style issue, and ran the pre-commits locally successfully. Not sure how to re-run the style job though to verify it's passing

[vpatov]

Ah, running the precommit on all files shows the issue. Should be good now

[vpatov]

@azmeuk anything else for this before we can merge?