fix: cz bump subdir

[Yusin0903]

Description

This pull request fixes the construction of the changelog file name in changelog.py to ensure type safety and correct path handling. It also adds proper error handling for missing or invalid changelog file names.

Checklist

• Add test cases to all the changes you introduce
• Run poetry all locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

The changelog command should now correctly resolve the changelog file path, regardless of whether the config path is set, and should raise a clear error if the file name is missing or invalid.

Steps to Test This Pull Request

1. Run poetry all and ensure all checks pass.
2. Run the changelog command with and without the --file-name argument.
3. Verify that the changelog file is created at the expected location.
4. Check that an error is raised if the changelog file name is missing or invalid.

Additional context

Sorry, I don' t know why my last branch have hide word problem. So I open lots of PR and close them .

By the way, I saw the github action warning
This is a scheduled Ubuntu 20.04 retirement. Ubuntu 20.04 LTS runner will be removed on 2025-04-15. For more details, see https://github.com/actions/runner-images/issues/11101Show more

[Lee-W]

Hey, sorry for the late review. I just came back and tried to rebase from the latest main.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.55%. Comparing base (120d514) to head (2bc2fa8).
Report is 598 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1391      +/-   ##
==========================================
+ Coverage   97.33%   97.55%   +0.21%     
==========================================
  Files          42       57      +15     
  Lines        2104     2658     +554     
==========================================
+ Hits         2048     2593     +545     
- Misses         56       65       +9     

Flag	Coverage Δ
unittests	97.55% <100.00%> (+0.21%)	⬆️

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[Lee-W]

I'm good with this PR. Thanks @Yusin0903 . But will leave it open for a few days so that others can check as well