chore: Update to tket-json-rs 0.6 and pyo3 0.22

[aborgna-q]

pyo3 migration guide: https://pyo3.rs/v0.22.5/migration#from-021-to-022

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.14%. Comparing base (ed8d3d4) to head (107854b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #668   +/-   ##
=======================================
  Coverage   82.14%   82.14%           
=======================================
  Files          50       50           
  Lines        6776     6777    +1     
  Branches     6776     6777    +1     
=======================================
+ Hits         5566     5567    +1     
  Misses        846      846           
  Partials      364      364           

Flag	Coverage Δ
rust	82.14% <100.00%> (+<0.01%)	⬆️

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