Unpin rust nightly

[samuelcolvin]

ref #145, is this fixed...?

rust-lang/rust#98833 is now fixed 🎉

[codecov]

Codecov Report

Merging #186 (ee852ed) into main (9caaaed) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
+ Coverage   97.96%   98.14%   +0.17%     
==========================================
  Files          45       46       +1     
  Lines        4477     4794     +317     
  Branches       32       35       +3     
==========================================
+ Hits         4386     4705     +319     
+ Misses         91       89       -2     

Impacted Files	Coverage Δ
src/validators/mod.rs	97.69% <0.00%> (-0.56%)	⬇️
src/validators/typed_dict.rs	99.38% <0.00%> (-0.01%)	⬇️
src/lib.rs	100.00% <0.00%> (ø)
src/validators/list.rs	100.00% <0.00%> (ø)
pydantic_core/_types.py	100.00% <0.00%> (ø)
src/errors/value_exception.rs	100.00% <0.00%> (ø)
src/validators/union.rs	99.16% <0.00%> (+0.16%)	⬆️
src/validators/tuple.rs	99.37% <0.00%> (+0.31%)	⬆️
src/input/input_python.rs	98.78% <0.00%> (+0.33%)	⬆️
src/errors/kinds.rs	99.44% <0.00%> (+0.43%)	⬆️
... and 3 more

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