Fix some python 3.11 issues

[Cadair]

No description provided.

[codecov]

Codecov Report

Merging #218 (dc68e3e) into main (de597eb) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
+ Coverage   97.09%   97.10%   +0.01%     
==========================================
  Files          35       35              
  Lines        1994     2004      +10     
==========================================
+ Hits         1936     1946      +10     
  Misses         58       58              

Impacted Files	Coverage Δ
dkist/dataset/dataset.py	92.30% <100.00%> (+0.54%)	⬆️
dkist/io/asdf/tests/test_dataset.py	100.00% <100.00%> (ø)
dkist/net/client.py	97.70% <100.00%> (ø)
dkist/net/attr_walker.py	100.00% <0.00%> (ø)

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