update to coverage_attribute feature

[davidhewitt]

Change Summary

Fixes CI issues after upstream nightly change rust-lang/rust#114656

Related issue number

N/A

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @samuelcolvin

[codecov]

Codecov Report

Merging #966 (67c3cff) into main (f6b14cc) will not change coverage.
Report is 5 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #966   +/-   ##
=======================================
  Coverage   93.80%   93.80%           
=======================================
  Files         105      105           
  Lines       15468    15468           
  Branches       25       25           
=======================================
  Hits        14510    14510           
  Misses        952      952           
  Partials        6        6           

Files Changed	Coverage Δ
src/build_tools.rs	81.63% <ø> (ø)
src/input/input_abstract.rs	90.40% <ø> (ø)
src/input/input_json.rs	91.83% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/tools.rs	97.50% <ø> (ø)
src/input/parse_json.rs	96.34% <100.00%> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #966 will improve performances by 12.81%

_{Comparing dh/coverage-attribute (67c3cff) with main (5edddd5)}

Summary

⚡ 3 improvements
✅ 135 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	dh/coverage-attribute	Change
⚡	test_core_string_strict_wrong	50.4 µs	44.7 µs	+12.81%
⚡	test_small_class_core_model	54.5 µs	48.4 µs	+12.63%
⚡	test_validate_literal[python-few_mixed]	32.9 µs	29.3 µs	+12.19%

[davidhewitt]

please review