chore: release slack-cli v4.0.1

[mwbrooks]

Summary

This pull request updates the documentation for release v4.0.1.

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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.22%. Comparing base (3ecb295) to head (d62ca0e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
+ Coverage   71.20%   71.22%   +0.02%     
==========================================
  Files         222      222              
  Lines       18664    18664              
==========================================
+ Hits        13289    13293       +4     
  Misses       4191     4191              
+ Partials     1184     1180       -4     

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[mwbrooks]

✅ Approved 😜

[zimeg]

@mwbrooks Amazing so amazing 🌈