fix(tox): Add fixed chardet ver. at requirements-dev.txt

[bjk7119]

Description

• Fix chardet version under 5.0.0 because of using requirements-dev.txt when running tox -e release command,

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update
• Refactoring, Maintenance
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Summary by CodeRabbit

• Chores
  • Updated development dependencies to improve build stability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 415639c4-77e8-47b2-8555-9b218d544e66

📥 Commits

Reviewing files that changed from the base of the PR and between 2d36db1 and 491fe73.

📒 Files selected for processing (1)

• requirements-dev.txt

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📝 Walkthrough

Walkthrough

Added chardet<5.0.0 dependency constraint to requirements-dev.txt, resolved existing duplication, and ensured proper file termination with newline character.

Changes

Cohort / File(s)	Summary
Dependency Constraint requirements-dev.txt	Added chardet<5.0.0 version constraint; removed duplicate flake8 entry; added trailing newline.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Fix tox error #181: Adds the same chardet<5.0.0 dependency constraint to requirements.txt in a parallel repository.

Suggested reviewers

• dd-jy

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: adding a fixed chardet version constraint to requirements-dev.txt for tox purposes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fixtox_new

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