Update S3 retriever.go mechanism

[pirlomnfw]

Description

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking changes (change that is not backward-compatible and/or changes current functionality)

Closes issue(s)

Resolve #

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

[netlify]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	a337e3f
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/65fc0656fed0490008a8a03a

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.97%. Comparing base (ef6c364) to head (a337e3f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1665      +/-   ##
==========================================
+ Coverage   87.84%   87.97%   +0.13%     
==========================================
  Files          77       77              
  Lines        3669     3660       -9     
==========================================
- Hits         3223     3220       -3     
+ Misses        360      356       -4     
+ Partials       86       84       -2     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud