fix: gcs manager race

[fracasula]

Description

Fixing data race.

Linear Ticket

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Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 97.82% and no project coverage change.

Comparison is base (d8cd51a) 78.07% compared to head (7a9868e) 78.07%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   78.07%   78.07%           
=======================================
  Files          67       67           
  Lines        4821     4822    +1     
=======================================
+ Hits         3764     3765    +1     
  Misses        859      859           
  Partials      198      198           

Files Changed	Coverage Δ
filemanager/gcsmanager.go	89.52% <97.82%> (+0.05%)	⬆️

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