Support all possible fields for RichTextElementParts.Date

[srtaalej]

Summary

This PR resolves issue 1533

Testing

No coresponding test were found, but confirmed properties with reference

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?)
• /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.

[srtaalej]

running validate script, will post result

[srtaalej]

running validate script, will post result

passed!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.00%. Comparing base (98950d9) to head (c2ce162).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1536      +/-   ##
==========================================
+ Coverage   84.93%   85.00%   +0.06%     
==========================================
  Files         113      113              
  Lines       12498    12501       +3     
==========================================
+ Hits        10615    10626      +11     
+ Misses       1883     1875       -8     

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[seratch]

Thank you for sending this PR! The changes already look good to me, but can you add this pattern to the existing unit test here? Doing so should resolve the codecov warning in CI builds.

[WilliamBergamin]

This looks good 👍

Thanks for adding the the unit tests to maintain the code coverage 💯