chore: update resolvelib to 1.2.0

[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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.22%. Comparing base (e07a81c) to head (02960ce).
⚠️ Report is 54 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3557   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files         118      118           
  Lines       12004    12004           
  Branches     1957     1957           
=======================================
  Hits        10230    10230           
  Misses       1213     1213           
  Partials      561      561           

Flag	Coverage Δ
unittests	85.07% <ø> (ø)

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