fix: not requiring @aws-sdk/client-s3 installed if not using lib-storage mock

[m-radzikowski]

No description provided.

[codecov-commenter]

Codecov Report

Merging #51 (eceda19) into main (87ed99d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #51   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           86        86           
  Branches        12        12           
=========================================
  Hits            86        86           

Impacted Files	Coverage Δ
src/libStorage.ts	100.00% <100.00%> (ø)

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