fix: close file

[zyyw]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Issue being fixed

Fixes #(issue)

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.54%. Comparing base (1d2f3d4) to head (19d2e20).

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-2.10.0   #20220      +/-   ##
==================================================
+ Coverage           67.52%   67.54%   +0.02%     
==================================================
  Files                 991      991              
  Lines              109189   109190       +1     
  Branches             2719     2719              
==================================================
+ Hits                73729    73757      +28     
+ Misses              31492    31471      -21     
+ Partials             3968     3962       -6     

Flag	Coverage Δ
unittests	67.54% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/pkg/scan/export/digest_calculator.go	45.45% <100.00%> (+5.45%)	⬆️

... and 5 files with indirect coverage changes

[MinerYang]

lgtm