Workaround for incompatiblity with Python 3.7

[gdubicki]

https://stackoverflow.com/a/73932581/2693875

[codecov]

Codecov Report

Base: 85.48% // Head: 85.50% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (98b5163) compared to base (5031448).
Patch has no changes to coverable lines.

❗ Current head 98b5163 differs from pull request most recent head 19bc470. Consider uploading reports for the commit 19bc470 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #720      +/-   ##
==========================================
+ Coverage   85.48%   85.50%   +0.01%     
==========================================
  Files          19       19              
  Lines        1075     1076       +1     
==========================================
+ Hits          919      920       +1     
  Misses        156      156              

Impacted Files	Coverage Δ
puppetboard/utils.py	92.94% <0.00%> (+0.08%)	⬆️

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