Bump mop version to 4.0.0-ursa-8-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 76.36%. Comparing base (26eec37) to head (0ae9527).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1461      +/-   ##
============================================
- Coverage     76.39%   76.36%   -0.03%     
- Complexity     1057     1058       +1     
============================================
  Files           116      116              
  Lines          4782     4782              
  Branches        374      374              
============================================
- Hits           3653     3652       -1     
- Misses          906      913       +7     
+ Partials        223      217       -6     

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