feat: allow self-referencing groups in dev-dependencies

[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.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ee1da21) 85.41% compared to head (6eb2b0f) 85.42%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1890   +/-   ##
=======================================
  Coverage   85.41%   85.42%           
=======================================
  Files         100      100           
  Lines        9133     9136    +3     
  Branches     1970     1970           
=======================================
+ Hits         7801     7804    +3     
  Misses        901      901           
  Partials      431      431           

Flag	Coverage Δ
unittests	85.23% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pdm/pytest.py	92.06% <ø> (ø)
src/pdm/models/repositories.py	73.68% <100.00%> (+0.27%)	⬆️

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