CallDecl __eq__ Fix

[Pusty]

Fixes #244, As suggested this fixes the problem of hash collisions (and specifically the hash(-1) == hash(-2) case).
Benchmark shows no change for either the original suggested change or the slightly more optimized one, but it seems reasonable to use it in the improved form.
There is also a change to the pyproject.toml - adding a version, which seemed required to get the CI to work for me

[codspeed-hq]

CodSpeed Performance Report

Merging #245 will not alter performance

_{Comparing Pusty:calldeclfix (c0a1565) with main (8b17580)}

Summary

✅ 8 untouched benchmarks

[saulshanabrook]

Thank you for this!