chore(deps): bump actions/download-artifact from 4 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...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/build.yml

@@ -183,7 +183,7 @@ jobs:
       suffix: '_${{ matrix.os }}-amd64'
     steps:
       - name: download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           path: artifacts
           pattern: '**/*${{ env.suffix }}'
@@ -246,7 +246,7 @@ jobs:
         id: get-sha
         run: echo "short_sha=${GITHUB_SHA:0:8}" >> $GITHUB_OUTPUT
       - name: Download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
       - name: List files
         run: ls -laR .
       - name: Workaround - delete all files over 2G, above github release file upload limit