fix: Proxy (HTTP_PROXY) settings are ignored for custom Repositories

[frostming]

Fixes #2880

Signed-off-by: Frost Ming me@frostming.com

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.25%. Comparing base (a3307c2) to head (f9e78d3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2882   +/-   ##
=======================================
  Coverage   85.24%   85.25%           
=======================================
  Files         106      106           
  Lines       10583    10587    +4     
  Branches     2301     2303    +2     
=======================================
+ Hits         9022     9026    +4     
  Misses       1088     1088           
  Partials      473      473           

Flag	Coverage Δ
unittests	85.03% <100.00%> (+<0.01%)	⬆️

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