chore: Update SplatVersion from 18.1.1 to 19.1.1

[glennawatson]

This pull request updates the version of the Splat package used in the project, ensuring that the codebase benefits from the latest features and fixes.

• Dependency updates:
  • Bumped the Splat package version from 18.1.1 to 19.1.1 in src/Directory.Packages.props.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.75%. Comparing base (0044f6c) to head (585b5eb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4260   +/-   ##
=======================================
  Coverage   88.75%   88.75%           
=======================================
  Files         169      169           
  Lines        7522     7522           
  Branches     1241     1241           
=======================================
  Hits         6676     6676           
  Misses        672      672           
  Partials      174      174           

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