Use new typing syntax for _pydantic_core.pyi

[Viicos]

• future import is assumed by default for stub files
• it is not necessary to use Python version checks, the convention is to use typing_extensions for objects added in Python>3.8.
• Removed some unnecessary string references

[codspeed-hq]

CodSpeed Performance Report

Merging #1217 will improve performances by 35.68%

_{Comparing Viicos:update-pyi (8cec15c) with main (f669db9)}

Summary

⚡ 20 improvements
✅ 128 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	Viicos:update-pyi	Change
⚡	test_core_future	47.2 µs	41.9 µs	+12.52%
⚡	test_core_future	29.4 µs	25.8 µs	+14.02%
⚡	test_core_future_str	26.5 µs	23.4 µs	+13.22%
⚡	test_date_from_datetime	38.7 µs	34.1 µs	+13.57%
⚡	test_date_from_str	27.5 µs	23.4 µs	+17.75%
⚡	test_core_root_model	95 µs	84 µs	+13.09%
⚡	test_definition_in_tree	4.5 ms	4 ms	+12.42%
⚡	test_generator_rust	32.8 µs	28.8 µs	+13.9%
⚡	test_list_of_nullable_core	491.8 µs	408.6 µs	+20.35%
⚡	test_small_class_core_dict	38.7 µs	28.5 µs	+35.68%
⚡	test_tuple_many_positional	33.9 µs	30 µs	+12.85%
⚡	test_tuple_many_variable	33.9 µs	30.1 µs	+12.62%
⚡	test_validate_literal[json-few_str_enum]	32.8 µs	28.5 µs	+15.26%
⚡	test_validate_literal[python-few_str_enum]	24.2 µs	21.2 µs	+14.31%
⚡	test_with_default	41.7 µs	37.2 µs	+12.13%
⚡	test_core_model_json	50.2 µs	44.3 µs	+13.17%
⚡	test_dataclass_serialization_json	44.8 µs	40 µs	+12.04%
⚡	test_dataclass_serialization_python	43.2 µs	38.4 µs	+12.52%
⚡	test_json_any_list_int	1,034.4 µs	919.1 µs	+12.54%
⚡	test_to_string_direct	32.3 µs	28.6 µs	+12.99%

[davidhewitt]

Thanks! I took the liberty to fix the formatting issues

[codecov]

Codecov Report

Merging #1217 (8cec15c) into main (ab503cb) will decrease coverage by 0.33%.
Report is 32 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1217      +/-   ##
==========================================
- Coverage   90.21%   89.88%   -0.33%     
==========================================
  Files         106      106              
  Lines       16339    16676     +337     
  Branches       36       40       +4     
==========================================
+ Hits        14740    14990     +250     
- Misses       1592     1667      +75     
- Partials        7       19      +12     

see 53 files with indirect coverage changes

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