Bump mop version to 2.10.4-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

Merging #1072 (f29530f) into branch-2.10.4 (0e066c8) will increase coverage by 0.38%.
Report is 1 commits behind head on branch-2.10.4.
The diff coverage is 96.49%.

❗ Current head f29530f differs from pull request most recent head d63d2b5. Consider uploading reports for the commit d63d2b5 to get more accurate results

@@                 Coverage Diff                 @@
##             branch-2.10.4    #1072      +/-   ##
===================================================
+ Coverage            76.11%   76.49%   +0.38%     
- Complexity             977      996      +19     
===================================================
  Files                  111      113       +2     
  Lines                 4350     4395      +45     
  Branches               342      345       +3     
===================================================
+ Hits                  3311     3362      +51     
+ Misses                 848      844       -4     
+ Partials               191      189       -2     

Files Changed	Coverage Δ
...o/streamnative/pulsar/handlers/mqtt/MqttTimer.java	66.66% <66.66%> (ø)
...ative/pulsar/handlers/mqtt/MqttAckTrackerImpl.java	97.91% <97.91%> (ø)
...qtt/support/MQTTBrokerProtocolMethodProcessor.java	78.17% <100.00%> (-0.57%)	⬇️
...ive/pulsar/handlers/mqtt/support/MQTTConsumer.java	97.70% <100.00%> (+0.08%)	⬆️

... and 5 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more