[backend] Update aws-java-sdk-v2 monorepo to v2.38.4 (release/current)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
software.amazon.awssdk:regions	2.33.7 -> 2.38.4
software.amazon.awssdk:apache-client	2.33.7 -> 2.38.4

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.51%. Comparing base (d1c6f1e) to head (3dac8d6).

Additional details and impacted files

@@                Coverage Diff                 @@
##             release/current    #4187   +/-   ##
==================================================
  Coverage              49.51%   49.51%           
+ Complexity              3581     3580    -1     
==================================================
  Files                    887      887           
  Lines                  26462    26462           
  Branches                1977     1977           
==================================================
  Hits                   13102    13102           
+ Misses                 12572    12570    -2     
- Partials                 788      790    +2     

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