Fix miscast of current_version

[coordt]

• When using the legacy configuration format, a single-digit version is parsed as an int

Fixes #99

[github-actions]

Version hint: patch
Current version: 0.15.2
New version (when merged): 0.15.3

_{Comment ID: Display the version hint-auto-generated}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2bbbd74) 93.05% compared to head (b8ea252) 93.06%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   93.05%   93.06%   +0.01%     
==========================================
  Files          19       19              
  Lines        1252     1254       +2     
  Branches      257      258       +1     
==========================================
+ Hits         1165     1167       +2     
  Misses         58       58              
  Partials       29       29              

Flag	Coverage Δ
python-3.10	93.06% <100.00%> (+0.01%)	⬆️
python-3.11	93.06% <100.00%> (+0.01%)	⬆️
python-3.8	93.06% <100.00%> (+0.01%)	⬆️
python-3.9	93.06% <100.00%> (+0.01%)	⬆️

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