Update to version 0.5.8

[whitequark]

Changes:

• Python 3.14 compatibility
• Miscellaneous fixes from main

[codecov]

Codecov Report

❌ Patch coverage is 68.29268% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.07%. Comparing base (83d5b60) to head (56b6530).
⚠️ Report is 9 commits behind head on v0.5.x.

Files with missing lines	Patch %	Lines
amaranth/lib/data.py	68.96%	6 Missing and 3 partials ⚠️
amaranth/lib/wiring.py	63.63%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           v0.5.x    #1635      +/-   ##
==========================================
- Coverage   91.29%   91.07%   -0.23%     
==========================================
  Files          46       46              
  Lines       11689    11740      +51     
  Branches     2562     2883     +321     
==========================================
+ Hits        10672    10692      +20     
- Misses        843      878      +35     
+ Partials      174      170       -4     

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