release: 0.26

[davidhewitt]

Bumps PyO3 to 0.26, fixes the deprecation warnings, and ready to ship.

Closes #94

[codecov]

Codecov Report

❌ Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.70%. Comparing base (e64436c) to head (a663a99).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/de.rs	85.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   83.70%   83.70%           
=======================================
  Files           3        3           
  Lines        1068     1068           
  Branches     1068     1068           
=======================================
  Hits          894      894           
  Misses        116      116           
  Partials       58       58           

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