chore(backport release-1.2): fix: set region on default config for AWS creds

[akuitybot]

Automated backport to release-1.2, triggered by a label in #3480.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 52.42%. Comparing base (733c4d9) to head (25d558e).
Report is 1 commits behind head on release-1.2.

Files with missing lines	Patch %	Lines
...nal/credentials/kubernetes/ecr/managed_identity.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.2    #3494      +/-   ##
===============================================
- Coverage        52.42%   52.42%   -0.01%     
===============================================
  Files              291      291              
  Lines            26669    26670       +1     
===============================================
  Hits             13982    13982              
- Misses           11922    11923       +1     
  Partials           765      765              

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