chore: release json2xml 6.4.0

[vinitkumar]

Summary\n\n- release json2xml 6.4.0\n- require json2xml-rs >=0.4.1 for the fast extra\n- update HISTORY.rst, RELEASE_NOTES.md, and uv.lock\n\nThe Rust dependency release json2xml-rs 0.4.1 was published first, followed by the Python 6.4.0 PyPI release.\n\n## Verification\n\n- Rust tests: 46 passed\n- Python tests: passed\n- PyPI publish workflow: passed\n- lat check: passed\n

Summary by Sourcery

Release json2xml 6.4.0 and json2xml-rs 0.4.1, updating metadata, dependencies, and release documentation for the new versions.

Enhancements:

• Document performance and memory improvements from the updated Rust serializer in the 6.4.0/0.4.1 release.

Build:

• Bump Python package to version 6.4.0 and Rust accelerator to 0.4.1, and require json2xml-rs>=0.4.1 for the fast extra.
• Refresh lockfile to capture the updated dependency set.

Documentation:

• Add release notes for json2xml 6.4.0 and json2xml-rs 0.4.1, including highlights, versions, and verification details.

[sourcery-ai]

Reviewer's Guide

Release json2xml Python package 6.4.0 and Rust accelerator json2xml-rs 0.4.1, updating version metadata, fast extra dependency bounds, release notes, and lockfile to reflect the new performance-focused Rust implementation.

File-Level Changes

Change	Details	Files
Bump Python package to version 6.4.0 and align public version metadata.	Updated project version field to 6.4.0 in the Python pyproject configuration. Synced version in the json2xml package init to 6.4.0.	pyproject.toml json2xml/__init__.py
Bump Rust accelerator crate to version 0.4.1 and update its packaging metadata.	Updated Cargo.toml package version to 0.4.1 for the Rust crate. Updated the Rust pyproject project version to 0.4.1 for the Python extension distribution. Adjusted Rust README release notes text to reference version 0.4.1 and describe allocation improvements.	rust/Cargo.toml rust/pyproject.toml rust/README.md
Tighten fast extra dependency requirement to the new Rust accelerator and document the combined release.	Increased the json2xml-rs lower bound in the fast extra from 0.4.0 to 0.4.1. Added a new 6.4.0/0.4.1 section to RELEASE_NOTES including performance and verification details. Updated HISTORY and uv.lock to reflect the new release state.	pyproject.toml RELEASE_NOTES.md HISTORY.rst uv.lock

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (84eedb5) to head (eecde7d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #339   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          714       714           
=========================================
  Hits           714       714           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[sourcery-ai]

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