Use Alchemy.config in specs

[mamhoff]

The Alchemy::Config object is deprecated in Alchemy 8.

Checklist

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have added tests to cover this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.67%. Comparing base (d02cffe) to head (39eb418).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3218   +/-   ##
=======================================
  Coverage   96.67%   96.67%           
=======================================
  Files         256      256           
  Lines        6614     6614           
=======================================
  Hits         6394     6394           
  Misses        220      220           

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