chore: Update to hugr 0.6.0, fix breaking changes

[aborgna-q]

Closes #463

[codecov]

Codecov Report

Attention: Patch coverage is 61.53846% with 5 lines in your changes missing coverage. Please review.

Project coverage is 82.22%. Comparing base (f153526) to head (f8a79af).

Files	Patch %	Lines
tket2/src/utils.rs	0.00%	0 Missing and 2 partials ⚠️
tket2/src/circuit.rs	80.00%	0 Missing and 1 partial ⚠️
tket2/src/circuit/extract_dfg.rs	66.66%	0 Missing and 1 partial ⚠️
tket2/src/passes/pytket.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #464      +/-   ##
==========================================
- Coverage   82.24%   82.22%   -0.02%     
==========================================
  Files          60       60              
  Lines        5942     5919      -23     
  Branches     5433     5410      -23     
==========================================
- Hits         4887     4867      -20     
+ Misses        796      793       -3     
  Partials      259      259              

Flag	Coverage Δ
python	97.05% <ø> (ø)
rust	80.83% <61.53%> (-0.03%)	⬇️

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