[release] Core stable release 1.19.1 updates

[otelbot-dotnet]

Note: This PR was opened automatically by the post-release workflow.

Merge once packages are available on NuGet and the build passes.

Changes

• Sets OTelLatestStableVer in Directory.Packages.props to 1.19.1.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.87%. Comparing base (a90ce5c) to head (6d047dd).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7796      +/-   ##
==========================================
- Coverage   91.90%   91.87%   -0.04%     
==========================================
  Files         339      339              
  Lines       18545    18545              
==========================================
- Hits        17044    17038       -6     
- Misses       1501     1507       +6     

Flag	Coverage Δ
unittests-PowerShellScripts	87.43% <ø> (ø)
unittests-Project-Experimental	91.96% <ø> (-0.02%)	⬇️
unittests-Project-Stable	91.98% <ø> (+<0.01%)	⬆️
unittests-Solution	91.91% <ø> (-0.06%)	⬇️
unittests-UnstableCoreLibraries-Experimental	50.73% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 2 files with indirect coverage changes

[opentelemetry-pr-dashboard]

Pull request dashboard status

Merged · refreshed 2026-09-21 10:03 UTC

Status above doesn't look right?

• Anything look wrong? Report it with what you expected; it helps us improve the dashboard.