Fix dwaveapiclient close

[randomir]

No description provided.

[codecov-commenter]

Codecov Report

Merging #492 (8d33965) into master (5c55571) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #492      +/-   ##
==========================================
+ Coverage   86.16%   86.18%   +0.02%     
==========================================
  Files          24       24              
  Lines        3245     3251       +6     
==========================================
+ Hits         2796     2802       +6     
  Misses        449      449              

Impacted Files	Coverage Δ
dwave/cloud/api/client.py	91.85% <100.00%> (+0.24%)	⬆️
dwave/cloud/api/resources.py	93.07% <100.00%> (+0.10%)	⬆️

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