Remove explicit llvmlite dep to fix Conda resolution on osx-64

[tylerjthomas9]

Ref JuliaAI/MLJModelRegistryTools.jl#10

Remove explicit llvmlite dep and numba channel from CondaPkg.toml. Pinning llvmlite to the numba channel causes resolution failures on osx-64 when Python is pinned to 3.13 (numba channel's llvmlite builds are lagging behind conda-forge).

@ablaom Let me know if this fixes it for you. I tested the resolution with pixi targeting osx-64 from an ARM machine and verified the old config fails with your error and the new config works.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.29%. Comparing base (b845d19) to head (e7130a8).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master       #9       +/-   ##
===========================================
+ Coverage   70.37%   97.29%   +26.92%     
===========================================
  Files           2        2               
  Lines          27       37       +10     
===========================================
+ Hits           19       36       +17     
+ Misses          8        1        -7     

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[ablaom]

@tylerjthomas9 Yes, this fixes my problem. Fantastic.

@davnn Can you please review?