fix(tar): data race fix

[idsulik]

Fixes: #9308

Description
Found and fixed data race condition in tar.go

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 63.54%. Comparing base (290280e) to head (c2109d5).
Report is 1133 commits behind head on main.

❗ Current head c2109d5 differs from pull request most recent head c391b0d. Consider uploading reports for the commit c391b0d to get more accurate results

Files	Patch %	Lines
pkg/skaffold/util/tar.go	63.63%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9309      +/-   ##
==========================================
- Coverage   70.48%   63.54%   -6.94%     
==========================================
  Files         515      635     +120     
  Lines       23150    32804    +9654     
==========================================
+ Hits        16317    20846    +4529     
- Misses       5776    10349    +4573     
- Partials     1057     1609     +552     

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[idsulik]

@ericzzzzzzz Hi!
Should I do anything else or I just need to wait?

[ericzzzzzzz]

Thank you for the fix!

[idsulik]

p.s. pushed an empty commit to restart the failed job