Bump mop version to 4.1.0-SNAPSHOT

[streamnativebot]

This is a PR created by snbot to trigger the check suite in each repository.

[github-actions]

@streamnativebot:Thanks for your contribution. For this PR, do we need to update docs?
(The PR template contains info about doc, which helps others know more about the changes. Can you provide doc-related info in this and future PR descriptions? Thanks)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.84%. Comparing base (26eec37) to head (f9c30e4).
Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1565      +/-   ##
============================================
+ Coverage     76.39%   80.84%   +4.45%     
+ Complexity     1057      297     -760     
============================================
  Files           116       27      -89     
  Lines          4782     1378    -3404     
  Branches        374      138     -236     
============================================
- Hits           3653     1114    -2539     
+ Misses          906      198     -708     
+ Partials        223       66     -157     

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