fix: cache the result of keyring queries

[frostming]

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

Attention: Patch coverage is 77.27273% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.20%. Comparing base (6c52c4e) to head (57996b1).
Report is 42 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/models/auth.py	72.22%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3374      +/-   ##
==========================================
- Coverage   85.21%   85.20%   -0.01%     
==========================================
  Files         112      112              
  Lines       11482    11492      +10     
  Branches     2515     2517       +2     
==========================================
+ Hits         9784     9792       +8     
- Misses       1171     1173       +2     
  Partials      527      527              

Flag	Coverage Δ
unittests	84.52% <77.27%> (-0.01%)	⬇️

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