Switch to GHC 9.6.6 and a new resolver

[nevrome]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 59.71%. Comparing base (eb024c7) to head (bc6ff13).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Poseidon/CLI/Serve.hs	41.66%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #328      +/-   ##
==========================================
+ Coverage   59.67%   59.71%   +0.04%     
==========================================
  Files          29       29              
  Lines        4364     4364              
  Branches      499      497       -2     
==========================================
+ Hits         2604     2606       +2     
  Misses       1261     1261              
+ Partials      499      497       -2     

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[stschiff]

Excellent, thanks. I've looked at the code changes, and I've just tested it on my Mac with the new GHC, including pedantic tests. Looks all good to me.