chore(release): tag version 2.1.0

[zimeg]

Summary

This PR tags the latest changes on main as version 2.1.0. This includes the milestones:

• 2.1: https://github.com/slackapi/slack-github-action/milestone/17
• 2.0.1: https://github.com/slackapi/slack-github-action/milestone/16

Which will soon be moved to 2.1! Full changelog: v2.0.0...ab965e5

Notes

• Hoping to follow up with a MAINTAINERS_GUIDE.md change to include changes to package-lock.json and related labels 🙏 ✨

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 99.85%. Comparing base (ab965e5) to head (7c4e510).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #438   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files           7        7           
  Lines         709      709           
=======================================
  Hits          708      708           
  Misses          1        1           

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[mwbrooks]

✅ LGTM! Thanks for calling out both Milestones included in this release!

[zimeg]

@WilliamBergamin @mwbrooks @lukegalbraithrussell Thank y'all for the fast reviews and all of the help in making this release possible!

I'm now going to merge this and tag a release with release notes 🤖 ✨