chore: Convert PR title action to module

[mister-ben]

Description

@actions/core was updated and no longer supports require(), which broke the PR title check action.

This converts it to use import instead.

actions/toolkit#2294

Requirements Checklist

• Feature implemented / Bug fixed
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.32%. Comparing base (31dfb75) to head (c27b311).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9152   +/-   ##
=======================================
  Coverage   84.32%   84.32%           
=======================================
  Files         120      120           
  Lines        8153     8153           
  Branches     1964     1964           
=======================================
  Hits         6875     6875           
  Misses       1278     1278           

☔ 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.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.