fix SSO token refresh bug

[thehesiod]

No description provided.

[codecov]

Codecov Report

Merging #1030 (de54ef2) into master (a39ca14) will increase coverage by 0.06%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##           master    #1030      +/-   ##
==========================================
+ Coverage   86.20%   86.27%   +0.06%     
==========================================
  Files          58       58              
  Lines        5743     5749       +6     
==========================================
+ Hits         4951     4960       +9     
+ Misses        792      789       -3     

Flag	Coverage Δ
unittests	86.27% <69.23%> (+0.06%)	⬆️

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Files Changed	Coverage Δ
aiobotocore/utils.py	64.52% <0.00%> (-0.40%)	⬇️
aiobotocore/tokens.py	94.38% <100.00%> (+0.06%)	⬆️
aiobotocore/waiter.py	90.74% <100.00%> (ø)
tests/python3.8/boto_tests/test_tokens.py	98.85% <100.00%> (+0.02%)	⬆️
tests/test_config.py	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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