Bump actions/download-artifact from 5 to 6 (#34)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
       run: echo "version=$((Select-Xml -Path ./ParquetSharp.DataFrame/ParquetSharp.DataFrame.csproj -XPath '/Project/PropertyGroup/Version/text()').node.Value)" >> $env:GITHUB_OUTPUT
       shell: pwsh
     - name: Download NuGet artifact
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v6
       with:
         name: nuget-package
         path: nuget
@@ -139,7 +139,7 @@ jobs:
         }
         echo "version=$version" >> $env:GITHUB_OUTPUT
     - name: Download NuGet artifact
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v6
       with:
         name: nuget-package
         path: nuget