fix: allow prereleases when the requirement is pinned even if disabled by project

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 85.60%. Comparing base (5ee042a) to head (96e99fa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3202   +/-   ##
=======================================
  Coverage   85.59%   85.60%           
=======================================
  Files         112      112           
  Lines       11222    11224    +2     
  Branches     2434     2435    +1     
=======================================
+ Hits         9606     9608    +2     
  Misses       1101     1101           
  Partials      515      515           

Flag	Coverage Δ
unittests	85.40% <100.00%> (+<0.01%)	⬆️

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