Astorpy changes in v6.0.0 remove `update_default_config`

[WillJRoper]

Describe the bug As of astropy v6.0.0 update_default_config has been removed. This causes the following error at import of hoki:

Traceback (most recent call last):
  File "/Users/willroper/Research/Synthesizer/synthesizer-grids/src/synthesizer_grids/create_grids/incident/sps/install_bpass2.2.1.py", line 9, in <module>
    from hoki import load
  File "/Users/willroper/envs/synthesizer-env/lib/python3.10/site-packages/hoki/__init__.py", line 6, in <module>
    from ._astropy_init import *   # noqa
  File "/Users/willroper/envs/synthesizer-env/lib/python3.10/site-packages/hoki/_astropy_init.py", line 21, in <module>
    from astropy.config.configuration import (
ImportError: cannot import name 'update_default_config' from 'astropy.config.configuration' (/Users/willroper/envs/synthesizer-env/lib/python3.10/site-packages/astropy/config/configuration.py)

See https://github.com/astropy/astropy/blob/main/CHANGES.rst#L7.

To Reproduce Steps to reproduce the behaviour:

• Create an environment with astropy v6.0.0
• Attempt to import hoki in any way.

Expected behaviour The import to work and use the astropy config method recommended after deprecation of update_default_config in v5.0.0.

Desktop (please complete the following information):

• OS: OSX 13.5.1 (but unrelated)
• N/A
• Version v1.7.1