Correct users.conversations property type - created

[seratch]

This pull request applies the two changes:

• Change the channels[].created type from string to integer
• Update users.conversations response types with the latest data

Some conditional properties may be missing but we can improve it afterwards. We will include this change in the next minor version - v1.9. Java compiler detects if the change affects existing apps.

This is the upstream fix for slackapi/node-slack-sdk#1252

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

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to the those rules.

[codecov]

Codecov Report

Merging #754 (ee346b8) into main (ffc3f59) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #754      +/-   ##
============================================
- Coverage     77.41%   77.38%   -0.04%     
+ Complexity     3303     3302       -1     
============================================
  Files           370      370              
  Lines          9807     9807              
  Branches        935      935              
============================================
- Hits           7592     7589       -3     
- Misses         1662     1664       +2     
- Partials        553      554       +1     

Impacted Files	Coverage Δ
...va/com/slack/api/socket_mode/SocketModeClient.java	67.76% <0.00%> (-1.98%)	⬇️

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