Bumps the snakebridge dependency to version 0.15.1 and regenerates the vLLM
bindings. This update focuses on improving the quality and clarity of the
generated Elixir documentation and syncing project metadata.

Key changes in this update:
- Enhanced Elixir docstrings in generated modules by providing clearer
references for Python module attributes.
- Improved Enum documentation by including explicit member values and
descriptions for types such as NanRepr, PlatformEnum, and RequestOutputKind.
- Updated coverage reports to provide more granular diagnostic information,
specifically identifying where attribute docstrings are not supported.
- Regenerated the snakebridge.lock and registry.json files to match the latest
generator output and hash.

The regenerated code removes redundant Python type hints in favor of more
descriptive attribute definitions, resulting in a cleaner documentation surface
for Elixir users.