fix: list direct dependencies in pdm outdated by default

[frostming]

Signed-off-by: Frost Ming [email protected]

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.

Close #3218

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.55%. Comparing base (d85760a) to head (25314b2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pdm/cli/commands/outdated.py	75.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3219      +/-   ##
==========================================
- Coverage   85.59%   85.55%   -0.04%     
==========================================
  Files         112      112              
  Lines       11257    11269      +12     
  Branches     2442     2446       +4     
==========================================
+ Hits         9635     9641       +6     
- Misses       1105     1109       +4     
- Partials      517      519       +2     

Flag	Coverage Δ
unittests	85.35% <75.00%> (-0.04%)	⬇️

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