Merge pull request #32 from patchlevel/renovate/actions-upload-artifact-6.x

Update actions/upload-artifact action to v6

Author: DanielBadura

.github/workflows/ci.yaml

@@ -105,7 +105,7 @@ jobs:
 
       - name: Upload digests (main only)
         if: ${{ github.ref_name == 'main' }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: digests-${{ matrix.version }}-${{ matrix.platform.id }}
           path: /tmp/digests/${{ matrix.version }}-${{ matrix.platform.id }}.txt