Add safe_compatible version specifiers saving strategy

[tkzt]

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.

To fix #3301.

Add one safe_compatible version specifiers saving strategy, which will pin version (let's say the version.micro is truthy) to ~={version.major}.{version.minor}.{version.micro}.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.32%. Comparing base (a3974f3) to head (f9fa3e3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3314      +/-   ##
==========================================
+ Coverage   85.31%   85.32%   +0.01%     
==========================================
  Files         112      112              
  Lines       11403    11406       +3     
  Branches     2488     2489       +1     
==========================================
+ Hits         9728     9732       +4     
+ Misses       1145     1144       -1     
  Partials      530      530              

Flag	Coverage Δ
unittests	85.12% <100.00%> (+0.01%)	⬆️

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[frostming]

Nice PR. Thanks