[release/9.0] Update branding to 9.0.19

[dotnet-bot]

This PR updates version branding on branch release/9.0.

Changes:

• Repository: winforms
  • PatchVersion: 18 → 19

Files Modified:

• eng/Versions.props (+1 -1)

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.85557%. Comparing base (545312a) to head (35c932b).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/9.0      #14706         +/-   ##
=====================================================
- Coverage     74.85731%   74.85557%   -0.00174%     
=====================================================
  Files             3022        3022                 
  Lines           630573      630573                 
  Branches         46811       46811                 
=====================================================
- Hits            472030      472019         -11     
- Misses          155160      155172         +12     
+ Partials          3383        3382          -1     

Flag	Coverage Δ
Debug	74.85557% <ø> (-0.00174%)	⬇️
integration	18.02525% <ø> (+0.00317%)	⬆️
production	47.90628% <ø> (-0.00387%)	⬇️
test	96.99900% <ø> (ø)
unit	44.90862% <ø> (-0.00633%)	⬇️

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

🚀 New features to boost your workflow:

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