Update GitHub Artifact Actions (#26)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -81,7 +81,7 @@ jobs:
 
       - name: Upload digest
         if: github.ref_type == 'tag'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: digests-linux-${{ matrix.arch }}
           path: ${{ runner.temp }}/digests/*
@@ -98,7 +98,7 @@ jobs:
         run: echo "GHCR_IMAGE=${GHCR_IMAGE,,}" >> $GITHUB_ENV
 
       - name: Download digests
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           path: ${{ runner.temp }}/digests
           pattern: digests-*