Fix for pydantic 2.12.0

Fix the following error at Galaxy startup:

```
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/logging/config.py", line 543, in configure
    formatters[name] = self.configure_formatter(
  File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/logging/config.py", line 655, in configure_formatter
    result = self.configure_custom(config)
  File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/logging/config.py", line 470, in configure_custom
    c = self.resolve(c)
  File "/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/logging/config.py", line 391, in resolve
    self.importer(used)
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/web_stack/__init__.py", line 13, in <module>
    from galaxy.model import database_utils
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/model/__init__.py", line 144, in <module>
    from galaxy.files.templates import (
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/files/__init__.py", line 13, in <module>
    from galaxy.files.sources import (
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/files/sources/__init__.py", line 19, in <module>
    from galaxy.files.models import (
  File "/home/runner/work/galaxy/galaxy/galaxy root/lib/galaxy/files/models.py", line 135, in <module>
    class FilesSourceProperties(StrictModel):
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.9/site-packages/pydantic/_internal/_model_construction.py", line 242, in __new__
    set_model_fields(cls, config_wrapper=config_wrapper, ns_resolver=ns_resolver)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.9/site-packages/pydantic/_internal/_model_construction.py", line 566, in set_model_fields
    fields, class_vars = collect_model_fields(cls, config_wrapper, ns_resolver, typevars_map=typevars_map)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.9/site-packages/pydantic/_internal/_fields.py", line 364, in collect_model_fields
    field_info = FieldInfo_.from_annotated_attribute(ann_type, assigned_value, _source=AnnotationSource.CLASS)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.9/site-packages/pydantic/fields.py", line 443, in from_annotated_attribute
    field_info = FieldInfo._construct(
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.9/site-packages/pydantic/fields.py", line 519, in _construct
    merged_field_info = cls(**merged_kwargs)
  File "/home/runner/work/galaxy/galaxy/galaxy root/.venv/lib/python3.9/site-packages/pydantic/fields.py", line 232, in __init__
Error:     raise TypeError('cannot specify both default and default_factory')
TypeError: cannot specify both default and default_factory
```

Author: nsoranzo

lib/galaxy/files/models.py

@@ -251,7 +251,6 @@ class FilesSourceProperties(StrictModel):
     supports: Annotated[
         FileSourceSupports,
         Field(
-            default_factory=FileSourceSupports,
             description="Features supported by this file source.",
         ),
     ] = FileSourceSupports()