Fix gridfs URI store

[utf]

Trying to connect to a GridFSURIStore results in the following error:

Traceback (most recent call last):
  File "/Users/alexmganose/test_connect.py", line 6, in <module>
    store.connect()
  File "/Users/alexmganose/dev/src/jobflow/src/jobflow/core/store.py", line 109, in connect
    additional_store.connect(force_reset=force_reset)
  File "/Users/alexmganose/.conda/envs/atomate2/lib/python3.9/site-packages/maggma/stores/gridfs.py", line 512, in connect
    conn = MongoClient(self.uri, **self.mongoclient_kwargs)
AttributeError: 'GridFSURIStore' object has no attribute 'mongoclient_kwargs'

This PR fixes the error.

If possible, please can you push a new release once this is merged.

[codecov]

Codecov Report

Merging #667 (e1fe067) into main (a2b2b60) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #667   +/-   ##
=======================================
  Coverage   89.43%   89.43%           
=======================================
  Files          42       42           
  Lines        3047     3048    +1     
=======================================
+ Hits         2725     2726    +1     
  Misses        322      322           

Impacted Files	Coverage Δ
src/maggma/stores/gridfs.py	94.41% <100.00%> (+0.03%)	⬆️

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[munrojm]

Done, patch releasing now.

[utf]

Great, thank you!