Update actions/upload-artifact action to v7 (#105)

Author: rinus

.github/workflows/build.yml

@@ -80,7 +80,7 @@ jobs:
           touch "$digests_dir/${digest#sha256:}"
 
       - name: Upload digest
-        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7
         with:
           name: "digests-${{ env.image_repo }}-${{ env.image_tag }}-${{ matrix.arch }}"
           path: "${{ runner.temp }}/digests/"