html: replace deprecated codecs.open with builtin open

[harvey0100]

codecs.open() is deprecated in favor of the builtin open() with an encoding parameter. This triggers pylint W4902 (deprecated-method) which causes the pre-commit pylint hook to fail for all commits since the check-lint script lints the entire repo.

[gemini-code-assist]

Summary of Changes

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This pull request modernizes the file input/output operations within the HTML plugin by migrating from the deprecated codecs.open() to the standard open() function. This change resolves a persistent pylint warning that was preventing successful linting, ensuring the codebase adheres to current best practices and passes automated checks.

Highlights

• Deprecation Fix: Replaced the deprecated codecs.open() function with the built-in open() function, utilizing its encoding parameter for file operations.
• Pylint Warning Resolution: Addressed the pylint W4902 (deprecated-method) warning, which was causing the pre-commit pylint hook to fail across the repository.
• Code Modernization: Updated file handling logic to align with modern Python practices, improving code maintainability and consistency.

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[gemini-code-assist]

Code Review

This pull request correctly replaces the deprecated codecs.open() with the built-in open() function, specifying the encoding as a keyword argument. The changes are straightforward and correctly applied, removing an unnecessary dependency on the codecs module for this purpose and resolving a pylint warning. The implementation is sound and there are no issues with the changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.67%. Comparing base (322254c) to head (d7b2d92).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6289      +/-   ##
==========================================
- Coverage   73.67%   73.67%   -0.01%     
==========================================
  Files         206      206              
  Lines       22634    22633       -1     
==========================================
- Hits        16676    16674       -2     
- Misses       5958     5959       +1     

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