chore: fix some sonar warnings

[thomaspoignant]

Description

fix some sonar warnings

Checklist

• I have tested this code
• I have followed the contributing guide

[netlify]

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

Name	Link
🔨 Latest commit	4668bef
🔍 Latest deploy log	https://app.netlify.com/projects/go-feature-flag-doc-preview/deploys/692e962d5edc36000896ace2

[netlify]

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

Name	Link
🔨 Latest commit	44f6d96
🔍 Latest deploy log	https://app.netlify.com/projects/go-feature-flag-doc-preview/deploys/692e98104f6fa80007b8ccdf

[codecov]

Codecov Report

❌ Patch coverage is 75.86207% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.32%. Comparing base (381c1de) to head (44f6d96).

Files with missing lines	Patch %	Lines
cmd/cli/evaluate/evaluate.go	66.66%	1 Missing and 1 partial ⚠️
cmd/cli/generate/manifest/manifest_cmd.go	33.33%	1 Missing and 1 partial ⚠️
cmd/cli/helper/print_output.go	33.33%	1 Missing and 1 partial ⚠️
cmd/relayproxy/api/server.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4391   +/-   ##
=======================================
  Coverage   85.32%   85.32%           
=======================================
  Files         145      145           
  Lines        6050     6053    +3     
=======================================
+ Hits         5162     5165    +3     
+ Misses        663      661    -2     
- Partials      225      227    +2     

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud