Fix #1348 channel_convert_to_public message events

[seratch]

This pull request resolves #1348

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

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[seratch]

unused import

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 74.72%. Comparing base (83b8e1b) to head (58ea6c2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../handler/MessageChannelConvertToPublicHandler.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1388   +/-   ##
=========================================
  Coverage     74.71%   74.72%           
- Complexity     4337     4338    +1     
=========================================
  Files           472      473    +1     
  Lines         13506    13509    +3     
  Branches       1378     1378           
=========================================
+ Hits          10091    10094    +3     
  Misses         2604     2604           
  Partials        811      811           

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