Add merge_group trigger to GitHub Actions workflows

[benjeffery]

Add merge_group trigger to workflows for GitHub merge queue functionality.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.32%. Comparing base (a5389d7) to head (51496fc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #105   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files           6        6           
  Lines         337      337           
  Branches       56       56           
=======================================
  Hits          328      328           
  Misses          7        7           
  Partials        2        2           

Flag	Coverage Δ
tszip	97.32% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ 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.