CompatHelper: bump compat for ContinuumArrays to 0.19, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the ContinuumArrays package from 0.18.3 to 0.18.3, 0.19.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (2c05699) to head (53722d0).
Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (2c05699) and HEAD (53722d0). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (2c05699)	HEAD (53722d0)
	10	5

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #230       +/-   ##
==========================================
- Coverage   92.10%   0.00%   -92.11%     
==========================================
  Files          19      19               
  Lines        1863    1818       -45     
==========================================
- Hits         1716       0     -1716     
- Misses        147    1818     +1671     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.