chore: align with upstream changes from Node qs v6.15.2

[techouse]

This pull request updates the Python qs_codec package to align its encode and decode behavior with Node qs version 6.15.2, ensuring improved compatibility and correctness. The changes include bug fixes to key normalization and delimiter handling, dependency updates for comparison tests, and new or updated tests to verify the new behavior.

Compatibility and Bug Fixes:

• The decode function now normalizes dotted keys before preserving them when depth=0 and allow_dots=True, matching Node qs 6.15.2 behavior. [1] [2] [3] [4]
• The encode function now uses the configured delimiter after the charset_sentinel token, aligning with the latest Node qs behavior. [1] [2]

Dependency and Test Infrastructure Updates:

• Updated the comparison test suite to use qs@6.15.2 and switched from npm to pnpm for dependency installation, ensuring tests run against the correct Node.js version. [1] [2] [3] [4] [5]

Testing Improvements:

• Added and updated tests to verify correct handling of dotted keys with depth=0, delimiter configuration with charset_sentinel, and filtering/encoding of None and Undefined values in both top-level and list contexts. [1] [2] [3] [4]

Documentation:

• Updated CHANGELOG.md to document the bug fixes and compatibility improvements in version 1.5.1-dev.

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📥 Commits

Reviewing files that changed from the base of the PR and between e96fb40 and d390fb8.

⛔ Files ignored due to path filters (1)

• tests/comparison/pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (7)

• CHANGELOG.md
• CONTRIBUTING.md
• src/qs_codec/encode.py
• src/qs_codec/utils/decode_utils.py
• tests/comparison/package.json
• tests/unit/decode_test.py
• tests/unit/encode_test.py

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

View in Codacy

🟢 Coverage 100.00% diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation (-1.00%)
Diff coverage	✅ 100.00% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e96fb40)	1904	1904	100.00%
Head commit (d390fb8)	1904 (+0)	1904 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#52)	4	4	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e96fb40) to head (d390fb8).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #52   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         1904      1904           
=========================================
  Hits          1904      1904           

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