Fix #1233 files.upload v2 import error

[seratch]

This pull request resolves #1233 for the main branch. I will make the same change for a hotfix too

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e9d7da) 74.04% compared to head (097e3fb) 74.04%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1234   +/-   ##
=========================================
  Coverage     74.04%   74.04%           
  Complexity     4083     4083           
=========================================
  Files           440      440           
  Lines         12995    12995           
  Branches       1310     1310           
=========================================
  Hits           9622     9622           
  Misses         2606     2606           
  Partials        767      767           

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