pkg_resources is deprecated

[timj]

The __init__.py has the following code:

__version__ = pkg_resources.get_distribution("firefly_client").version

This issues a deprecation warning now because pkg_resources is deprecated.

The modern equivalent is to use importlib.metadata.version:

from importlib.metadata import PackageNotFoundError, version

__version__: str

try:
    __version__ = version("firefly_client")
except PackageNotFoundError:
    # package is not installed
    __version__ = "0.0.0"

[timj]

@robyww would you like a pull request for this fix?