fix(file): do not panic if creation time is not supported

[orhun]

Description of change

Fixes #21

How has this been tested? (if applicable)

Not tested, but it's a simple change.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 3.66%. Comparing base (236d19e) to head (2aaa9d7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/file.rs	0.00%	4 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff            @@
##            main     #25      +/-   ##
========================================
- Coverage   3.67%   3.66%   -0.00%     
========================================
  Files         18      18              
  Lines       2212    2218       +6     
========================================
  Hits          81      81              
- Misses      2131    2137       +6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.