Release 4.21.0 a.1

[merkushin]

This is for our first Alpha release which will be deployed on wp.com.

The following release steps were skipped intentionally:

• Update the changelog.
• Replace $$next-version$$.
• Update the readme.txt stable tag.

[github-actions]

Please perform the following tests with the built package in a new installation before publishing:

• Check that the installed version is correct on the Plugins page.
• Create and publish a course, a module, and a lesson to the course.
• Enable the learning mode in the course.
• Log in with a user and complete the course.
• Visit Students in admin and observe that the user is displayed with the course completed.
• Disable learning mode in the course.
• Visit the course again to make sure that it displayed correctly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1a9a3ee) 51.51% compared to head (b0b2af2) 51.51%.
Report is 1 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk    #7500   +/-   ##
=========================================
  Coverage     51.51%   51.51%           
  Complexity    11231    11231           
=========================================
  Files           622      622           
  Lines         47503    47503           
  Branches        414      414           
=========================================
+ Hits          24469    24470    +1     
+ Misses        22701    22700    -1     
  Partials        333      333           

see 1 file with indirect coverage changes

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[renatho]

LGTM!