Use codecov/codecov-action@v3 to upload code coverage

[zimeg]

Summary

This PR builds upon the changes in #1375 and replaces the codecov-uploader with the codecov-action. All in the hope of having coverage stats report successfully.

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-src (Documents, have you run ./scripts/docs.sh?)
• /docs-src-v2 (Documents, have you run ./scripts/docs-v2.sh?)
• /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.

[codecov]

Codecov Report

Merging #1376 (96c426a) into main (027a287) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1376   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         111      111           
  Lines       11582    11582           
=======================================
  Hits         9910     9910           
  Misses       1672     1672           

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[seratch]

Thanks for this change. The current way still works while it can be unstable due to codecov server-side issues. However, the way proposed here is a better one (our other repos do the same already). LGTM