chore: Bump to hugr-0.7.0

[doug-q]

No description provided.

[doug-q]

removing tket2 from workspace dependencies is for the best.

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.19%. Comparing base (10639b9) to head (aa0e468).

Files	Patch %	Lines
tket2/src/circuit/extract_dfg.rs	85.71%	0 Missing and 1 partial ⚠️
tket2/src/ops.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #469      +/-   ##
==========================================
+ Coverage   82.10%   82.19%   +0.09%     
==========================================
  Files          60       60              
  Lines        5923     5921       -2     
  Branches     5402     5400       -2     
==========================================
+ Hits         4863     4867       +4     
+ Misses        803      798       -5     
+ Partials      257      256       -1     

Flag	Coverage Δ
python	96.73% <ø> (ø)
rust	80.79% <84.61%> (+0.10%)	⬆️

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