stop allowing str as basic input to validators

[samuelcolvin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #256 (4b600cd) into main (08cecc5) will increase coverage by 0.03%.
The diff coverage is 97.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
+ Coverage   98.54%   98.58%   +0.03%     
==========================================
  Files          50       50              
  Lines        5166     5157       -9     
  Branches       36       36              
==========================================
- Hits         5091     5084       -7     
+ Misses         74       73       -1     
+ Partials        1        0       -1     

Impacted Files	Coverage Δ
src/validators/union.rs	99.11% <95.83%> (-0.01%)	⬇️
pydantic_core/core_schema.py	100.00% <100.00%> (+0.84%)	⬆️
src/validators/mod.rs	99.62% <100.00%> (-0.01%)	⬇️

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