[SqlClient] Update mssql/server test container

[martincostello]

Changes

Update to the latest mssql/server image.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[Copilot]

Pull Request Overview

This PR updates the SQL Server test container to a newer patch release of the mssql/server image.

• Bump test container image from 2022-CU14 to 2022-CU19.

Comments suppressed due to low confidence (1)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.82%. Comparing base (71655ce) to head (c28bdab).
Report is 879 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2825       +/-   ##
===========================================
+ Coverage   73.91%   87.82%   +13.91%     
===========================================
  Files         267        9      -258     
  Lines        9615      460     -9155     
===========================================
- Hits         7107      404     -6703     
+ Misses       2508       56     -2452     

Flag	Coverage Δ
unittests-Instrumentation.SqlClient	87.82% <ø> (?)

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see 270 files with indirect coverage changes

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