acquisition/file: minimal fix for data race in tests

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.97%. Comparing base (ceb9987) to head (581182d).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4326   +/-   ##
=======================================
  Coverage   62.97%   62.97%           
=======================================
  Files         473      473           
  Lines       33454    33454           
=======================================
  Hits        21068    21068           
  Misses      10271    10271           
  Partials     2115     2115           

Flag	Coverage Δ
bats	46.52% <ø> (ø)
unit-linux	35.93% <ø> (-0.01%)	⬇️
unit-windows	24.39% <ø> (-0.01%)	⬇️

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