Update artifact-upload and artifact-download actions to v4 in build pipeline
Updated the GitHub Actions workflow to use the latest v4 versions of the artifact actions:
-
actions/upload-artifact@v2→actions/upload-artifact@v4 -
actions/download-artifact@v2→actions/download-artifact@v4(both instances)
This ensures the build pipeline uses the most current and supported versions of these actions. The v4 actions provide improved performance, better security, and continued support from GitHub.
All existing functionality is preserved - the workflow continues to upload build artifacts (NuGet packages) and download them for both development and production NuGet publishing jobs.
Verified that build, test, and packaging functionality works correctly after the update.
Fixes #26.
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