Bump actions/upload-artifact from 3 to 4 (#48)

Author: dependabot[bot]

.github/workflows/dotnet.yml

@@ -96,7 +96,7 @@ jobs:
       run: dotnet pack -c Release --output ${{ env.NuGetDirectory }}
     - name: Get version of dll
       run: (Get-Item ./artifacts/bin/Llm/release/Llm.dll).VersionInfo.ProductVersion
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         name: nuget
         if-no-files-found: error