fix: allow for relative paths for changelog file

[flakey5]

Re nodejs/node#57343 (comment)

Description

Validation

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run node --run test and all tests passed.
• I have check code formatting with node --run format & node --run lint.
• I've covered new added functionality with unit tests if necessary.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.58%. Comparing base (97b3495) to head (49f6213).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #288   +/-   ##
=======================================
  Coverage   90.58%   90.58%           
=======================================
  Files          63       63           
  Lines        4767     4767           
  Branches      191      191           
=======================================
  Hits         4318     4318           
  Misses        446      446           
  Partials        3        3           

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