fix: encoding should be kept as None by default + pin pandas to v1.2.5

[PrettyWood]

Change Summary

Related issue number

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable

[codecov]

Codecov Report

Merging #122 (cd26af8) into main (5d7e6c8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #122   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          770       770           
=========================================
  Hits           770       770           

Impacted Files	Coverage Δ
peakina/datasource.py	100.00% <100.00%> (ø)
peakina/helpers.py	100.00% <100.00%> (ø)

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[austil]

Suggested change

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[austil]

🟢