Support pathlike objects in upload util

[allen-pattern]

Summary

Allow passing Path objects into file upload functions.

Testing

Attempt to pass a Path object to one of the file upload functions that takes a string path. Also pass a string path to ensure there are no regressions.

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

I did get S3 test failures with the latter (without my change), FYI.

[WilliamBergamin]

This looks like a nice enhancement 💯 thank you!
Any chance you could add unit tests for file passed as str and os.PathLike? if it is not trivial let me know I will take a look

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (d6c206a) to head (6d0dc4a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1656   +/-   ##
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  Coverage   85.33%   85.33%           
=======================================
  Files         113      113           
  Lines       12802    12802           
=======================================
  Hits        10924    10924           
  Misses       1878     1878           

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