remove default zero(UInt) from hash seed

[adienes]

this creates a 1-arg method Base.hash(:: AbstractExpressionNode{T}) morespecific than the default hash(::Any) fallback, and since the default seed is not 0 anymore this leads to hash inconsistencies and bugs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.84%. Comparing base (d4b12df) to head (0e15bc1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   96.67%   96.84%   +0.17%     
==========================================
  Files          30       30              
  Lines        2614     2602      -12     
==========================================
- Hits         2527     2520       -7     
+ Misses         87       82       -5     

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[MilesCranmer]

Thanks.

Other issues seem to be related to Julia 1.12.0