Bump actions/download-artifact from 5 to 6

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]>

Author: dependabot[bot]

.github/workflows/publish-chocolatey.yml

@@ -31,7 +31,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: Fetch the Chocolatey package from GitHub
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: scala.nupkg
       - name: Publish the package to Chocolatey

.github/workflows/test-chocolatey.yml

@@ -35,7 +35,7 @@ jobs:
           distribution: temurin
           java-version: ${{ inputs.java-version }}
       - name: Download the 'nupkg' from GitHub Artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: scala.nupkg
           path: ${{ env.CHOCOLATEY-REPOSITORY }}